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Vol. 87 No. 4 December 1958

National Science Development Board

Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.

Vice Chairman and Executive Director

Members of the Board

Teodoro Evangelista, LL.B., LL.D. Florencio A. Medina, M.S.Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Crisostomo Ortigas, M.S.M.EJoaquin Marañon, D.Sc. Antonio G. Sison, M.D.Gregorio Y. Zara, D.Sc.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Joaquin Marañon, D.Sc.Editor

Eduardo Quisumbing, Ph.D. Canuto G. Manuel, D.Sc. Associate Editor Associate Editor

Mauro Garcia, B.S.E.Copy Editor

Contributing Editors

Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.

Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.

Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.

Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.

Vol. 87 No. 3 September 1958

National Science Development Board

Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.

Vice Chairman and Executive Director

Members of the Board

Teodoro Evangelista, LL.B., LL.D. Florencio A. Medina, M.S.Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Crisostomo Ortigas, M.S.M.EJoaquin Marañon, D.Sc. Antonio G. Sison, M.D.Gregorio Y. Zara, D.Sc.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Joaquin Marañon, D.Sc.Editor

Eduardo Quisumbing, Ph.D. Canuto G. Manuel, D.Sc. Associate Editor Associate Editor

Mauro Garcia, B.S.E.Copy Editor

Contributing Editors

Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.

Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.

Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.

Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.

Vol. 87 No.1 March 1958

Published by the Institute of Science and Technology(Formerly Bureau of Science)

[Entered as second-class matter at the Post Office at Manila, Phillipines.]

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor (on leave)

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Anthropology

H.O. Beyer, M.A.;Robert B. Fox, Ph.D.; Ricardo E. Galang, M.A

Botany

Feliciano M. Clara, Ph.D.; E.B. Copeland Ph.D.; T.G. Fajardo, Ph.DA.F. Fischer, C.E., F.M.; Nemesio B. Mendiola, Ph.D

Nicanor G. Teodoro, Ph.D.

Chemistry

F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.; Marcos M. Alicante, Ph.D.Felix V. Espino, Ch.E.; Manuel L. Roxas, Ph.D.;

Patrocinio Valenzuela, Ph.D.

Geology

Leopoldo F. Abad, M.S.; Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Manuel V. Arguelles, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D. Hilario Lara, M.D.; Walfirdo De Leon, M.D.

Cristobal Manalang, M.D.; Daniel de la Paz, M.D.; Carmelo Reyes, M.D.Jose Rodriguez, M.D.; Agerico B. M. Sison, M.D.

Antonio Sison, M.D.; H.W. Wade, M.D..

Zoology

Leopoldo S. Clemente, Ph.D.; Canuto G. Manuel, D.Sc. Gonzalo Merino, Ph.D.; Heraclio R. Montalban, M.A.

Faustino Q. Otanes, M.S.; Manuel D. Sumulong, M.S., D.V.M.Leopoldo B. Uichanco, D.Sc.; Agustin F. Umali, B.S.

Deogracias V. Villadolid, Ph.D.; Lope M. Yutuc, D.V.M.

Vol. 86 No.4 December 1957

Published by the Institute of Science and Technology(Formerly Bureau of Science)

[Entered as second-class matter at the Post Office at Manila, Phillipines.]

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Anthropology

H.O. Beyer, M.A.;Robert B. Fox, Ph.D.; Ricardo E. Galang, M.A

Botany

Feliciano M. Clara, Ph.D.; E.B. Copeland Ph.D.; T.G. Fajardo, Ph.DA.F. Fischer, C.E., F.M.; Nemesio B. Mendiola, Ph.D

Nicanor G. Teodoro, Ph.D.

Chemistry

F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.; Marcos M. Alicante, Ph.D.Felix V. Espino, Ch.E.; Manuel L. Roxas, Ph.D.;

Patrocinio Valenzuela, Ph.D.

Geology

Leopoldo F. Abad, M.S.; Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Manuel V. Arguelles, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D. Hilario Lara, M.D.;Liborio Gomez, M.D.; Walfirdo De Leon, M.D.

Cristobal Manalang, M.D.; Daniel de la Paz, M.D.; Carmelo Reyes, M.D.Jose Rodriguez, M.D.; Agerico B. M. Sison, M.D.

Antonio Sison, M.D.; H.W. Wade, M.D..

Zoology

Leopoldo S. Clemente, Ph.D.; Canuto G. Manuel, D.Sc. Gonzalo Merino, Ph.D.; Heraclio R. Montalban, M.A.

Faustino Q. Otanes, M.S.; Manuel D. Sumulong, M.S., D.V.M.Leopoldo B. Uichanco, D.Sc.; Agustin F. Umali, B.S.

Deogracias V. Villadolid, Ph.D.; Lope M. Yutuc, D.V.M.

Vol. 86 No.3 September 1957

Published by the Institute of Science and Technology(Formerly Bureau of Science)

[Entered as second-class matter at the Post Office at Manila, Phillipines.]

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Anthropology

H.O. Beyer, M.A.;Robert B. Fox, Ph.D.; Ricardo E. Galang, M.A

Botany

Feliciano M. Clara, Ph.D.; E.B. Copeland Ph.D.; T.G. Fajardo, Ph.DA.F. Fischer, C.E., F.M.; Nemesio B. Mendiola, Ph.D

Nicanor G. Teodoro, Ph.D.

Chemistry

F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.; Marcos M. Alicante, Ph.D.Felix V. Espino, Ch.E.; Manuel L. Roxas, Ph.D.;

Patrocinio Valenzuela, Ph.D.

Geology

Leopoldo F. Abad, M.S.; Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Manuel V. Arguelles, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D. Hilario Lara, M.D.;Liborio Gomez, M.D.; Walfirdo De Leon, M.D.

Cristobal Manalang, M.D.; Daniel de la Paz, M.D.; Carmelo Reyes, M.D.Jose Rodriguez, M.D.; Agerico B. M. Sison, M.D.

Antonio Sison, M.D.; H.W. Wade, M.D..

Zoology

Leopoldo S. Clemente, Ph.D.; Canuto G. Manuel, D.Sc. Gonzalo Merino, Ph.D.; Heraclio R. Montalban, M.A.

Faustino Q. Otanes, M.S.; Manuel D. Sumulong, M.S., D.V.M.Leopoldo B. Uichanco, D.Sc.; Agustin F. Umali, B.S.

Deogracias V. Villadolid, Ph.D.; Lope M. Yutuc, D.V.M.

Vol. 86 No.2 June 1957

Published by the Institute of Science and Technology(Formerly Bureau of Science)

[Entered as second-class matter at the Post Office at Manila, Phillipines.]

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Anthropology

H.O. Beyer, M.A.;Robert B. Fox, Ph.D.; Ricardo E. Galang, M.A

Botany

Feliciano M. Clara, Ph.D.; E.B. Copeland Ph.D.; T.G. Fajardo, Ph.DA.F. Fischer, C.E., F.M.; Nemesio B. Mendiola, Ph.D

Nicanor G. Teodoro, Ph.D.

Chemistry

F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.; Marcos M. Alicante, Ph.D.Felix V. Espino, Ch.E.; Manuel L. Roxas, Ph.D.;

Patrocinio Valenzuela, Ph.D.

Geology

Leopoldo F. Abad, M.S.; Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Manuel V. Arguelles, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D. Hilario Lara, M.D.;Liborio Gomez, M.D.; Walfirdo De Leon, M.D.

Cristobal Manalang, M.D.; Daniel de la Paz, M.D.; Carmelo Reyes, M.D.Jose Rodriguez, M.D.; Agerico B. M. Sison, M.D.

Antonio Sison, M.D.; H.W. Wade, M.D..

Zoology

Leopoldo S. Clemente, Ph.D.; Canuto G. Manuel, D.Sc. Gonzalo Merino, Ph.D.; Heraclio R. Montalban, M.A.

Faustino Q. Otanes, M.S.; Manuel D. Sumulong, M.S., D.V.M.Leopoldo B. Uichanco, D.Sc.; Agustin F. Umali, B.S.

Deogracias V. Villadolid, Ph.D.; Lope M. Yutuc, D.V.M.

Vol. 86 No.1 March 1957

Published by the Institute of Science and Technology(Formerly Bureau of Science)

[Entered as second-class matter at the Post Office at Manila, Phillipines.]

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Anthropology

H.O. Beyer, M.A.;Robert B. Fox, Ph.D.; Ricardo E. Galang, M.A

Botany

Feliciano M. Clara, Ph.D.; E.B. Copeland Ph.D.; T.G. Fajardo, Ph.DA.F. Fischer, C.E., F.M.; Nemesio B. Mendiola, Ph.D

Nicanor G. Teodoro, Ph.D.

Chemistry

F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.; Marcos M. Alicante, Ph.D.Felix V. Espino, Ch.E.; Manuel L. Roxas, Ph.D.;

Patrocinio Valenzuela, Ph.D.

Geology

Leopoldo F. Abad, M.S.; Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Manuel V. Arguelles, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D. Hilario Lara, M.D.;Liborio Gomez, M.D.; Walfirdo De Leon, M.D.

Cristobal Manalang, M.D.; Daniel de la Paz, M.D.; Carmelo Reyes, M.D.Jose Rodriguez, M.D.; Agerico B. M. Sison, M.D.

Antonio Sison, M.D.; H.W. Wade, M.D..

Zoology

Leopoldo S. Clemente, Ph.D.; Canuto G. Manuel, D.Sc. Gonzalo Merino, Ph.D.; Heraclio R. Montalban, M.A.

Faustino Q. Otanes, M.S.; Manuel D. Sumulong, M.S., D.V.M.Leopoldo B. Uichanco, D.Sc.; Agustin F. Umali, B.S.

Deogracias V. Villadolid, Ph.D.; Lope M. Yutuc, D.V.M.

Vol. 85 No.4 December 1956

Published by the Institute of Science and Technology(Formerly Bureau of Science)

[Entered as second-class matter at the Post Office at Manila, Phillipines.]

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Anthropology

H.O. Beyer, M.A.;Robert B. Fox, Ph.D.; Ricardo E. Galang, M.A

Botany

Feliciano M. Clara, Ph.D.; E.B. Copeland Ph.D.; T.G. Fajardo, Ph.DA.F. Fischer, C.E., F.M.; Nemesio B. Mendiola, Ph.D

Nicanor G. Teodoro, Ph.D.

Chemistry

F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.; Marcos M. Alicante, Ph.D.Felix V. Espino, Ch.E.; A.J. Hermano, D.Sc.

Manuel L. Roxas, Ph.D.; Patrocinio Valenzuela, Ph.D.

Geology

Leopoldo F. Abad, M.S.; Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Manuel V. Arguelles, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D. Hilario Lara, M.D.;Liborio Gomez, M.D.; Walfirdo De Leon, M.D.

Cristobal Manalang, M.D.; Daniel de la Paz, M.D.; Carmelo Reyes, M.D.Jose Rodriguez, M.D.; Agerico B. M. Sison, M.D.

Antonio Sison, M.D.; H.W. Wade, M.D..

Zoology

Leopoldo S. Clemente, Ph.D.; Canuto G. Manuel, D.Sc. Gonzalo Merino, Ph.D.; Heraclio R. Montalban, M.A.

Faustino Q. Otanes, M.S.; Manuel D. Sumulong, M.S., D.V.M.Leopoldo B. Uichanco, D.Sc.; Agustin F. Umali, B.S.

Deogracias V. Villadolid, Ph.D.; Lope M. Yutuc, D.V.M.

Vol. 85 No.3 September 1956

Published by the Institute of Science and Technology(Formerly Bureau of Science)

[Entered as second-class matter at the Post Office at Manila, Phillipines.]

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Anthropology

H.O. Beyer, M.A.;Robert B. Fox, Ph.D.; Ricardo E. Galang, M.A

Botany

Feliciano M. Clara, Ph.D.; E.B. Copeland Ph.D.; T.G. Fajardo, Ph.D.A.F. Fischer, C.E., F.M.; Nemesio B. Mendiola, Ph.D.

Nicanor G. Teodoro, Ph.D.

Chemistry

F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.; Marcos M. Alicante, Ph.D.Felix V. Espino, Ch.E.; A.J. Hermano, D.Sc.

Manuel L. Roxas, Ph.D.; Patrocinio Valenzuela, Ph.D.

Geology

Leopoldo F. Abad, M.S.; Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Manuel V. Arguelles, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D. Hilario Lara, M.D.;Liborio Gomez, M.D.; Walfirdo De Leon, M.D.

Cristobal Manalang, M.D.; Daniel de la Paz, M.D.; Carmelo Reyes, M.D.Jose Rodriguez, M.D.; Agerico B. M. Sison, M.D.

Antonio Sison, M.D.; H.W. Wade, M.D..

Zoology

Leopoldo S. Clemente, Ph.D.; Canuto G. Manuel, D.Sc. Gonzalo Merino, Ph.D.; Heraclio R. Montalban, M.A.

Faustino Q. Otanes, M.S.; Manuel D. Sumulong, M.S., D.V.M.Leopoldo B. Uichanco, D.Sc.; Agustin F. Umali, B.S.

Deogracias V. Villadolid, Ph.D.; Lope M. Yutuc, D.V.M.

Vol. 85 No.2 June 1956

Published by the Institute of Science and Technology(Formerly Bureau of Science)

[Entered as second-class matter at the Post Office at Manila, Phillipines.]

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Anthropology

H.O. Beyer, M.A.;Robert B. Fox, Ph.D.; Ricardo E. Galang, M.A

Botany

Feliciano M. Clara, Ph.D.; E.B. Copeland Ph.D.; T.G. Fajardo, Ph.D.A.F. Fischer, C.E., F.M.; Nemesio B. Mendiola, Ph.D.

Nicanor G. Teodoro, Ph.D.

Chemistry

F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.; Marcos M. Alicante, Ph.D.Felix V. Espino, Ch.E.; A.J. Hermano, D.Sc.

Manuel L. Roxas, Ph.D.; Patrocinio Valenzuela, Ph.D.

Geology

Leopoldo F. Abad, M.S.; Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Manuel V. Arguelles, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D. Hilario Lara, M.D.; Liborio Gomez, M.D.; Walfirdo De Leon, M.D.

Cristobal Manalang, M.D.; Daniel de la Paz, M.D.; Carmelo Reyes, M.D.Jose Rodriguez, M.D.; Agerico B. M. Sison, M.D.

Antonio Sison, M.D.; H.W. Wade, M.D..

Zoology

Leopoldo S. Clemente, Ph.D.; Canuto G. Manuel, D.Sc. Gonzalo Merino, Ph.D.; Heraclio R. Montalban, M.A.

Faustino Q. Otanes, M.S.; Manuel D. Sumulong, M.S., D.V.M.Leopoldo B. Uichanco, D.Sc.; Agustin F. Umali, B.S.

Deogracias V. Villadolid, Ph.D.; Lope M. Yutuc, D.V.M.

Vol. 85 No.1 March 1956

Published by the Institute of Science and Technology(Formerly Bureau of Science)

[Entered as second-class matter at the Post Office at Manila, Phillipines.]

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Anthropology

H.O. Beyer, M.A.;Robert B. Fox, Ph.D.; Ricardo E. Galang, M.A

Botany

Feliciano M. Clara, Ph.D.; E.B. Copeland Ph.D.; T.G. Fajardo, Ph.D.A.F. Fischer, C.E., F.M.; Nemesio B. Mendiola, Ph.D.

Nicanor G. Teodoro, Ph.D.

Chemistry

F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.; Marcos M. Alicante, Ph.D.Felix V. Espino, Ch.E.; A.J. Hermano, D.Sc.

Manuel L. Roxas, Ph.D.; Patrocinio Valenzuela, Ph.D.

Geology

Leopoldo F. Abad, M.S.; Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Manuel V. Arguelles, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D. Hilario Lara, M.D.; Liborio Gomez, M.D.; Walfirdo De Leon, M.D.

Cristobal Manalang, M.D.; Daniel de la Paz, M.D.; Carmelo Reyes, M.D.Jose Rodriguez, M.D.; Agerico B. M. Sison, M.D.

Antonio Sison, M.D.; H.W. Wade, M.D..

Zoology

Leopoldo S. Clemente, Ph.D.; Canuto G. Manuel, D.Sc. Gonzalo Merino, Ph.D.; Heraclio R. Montalban, M.A.

Faustino Q. Otanes, M.S.; Manuel D. Sumulong, M.S., D.V.M.Leopoldo B. Uichanco, D.Sc.; Agustin F. Umali, B.S.

Deogracias V. Villadolid, Ph.D.; Lope M. Yutuc, D.V.M.

Vol. 84 January to December 1955

Published by the Institute of Science and Technology(Formerly Bureau of Science)

[Entered as second-class matter at the Post Office at Manila, Phillipines.]

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.

A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; .W. Wade, M.D.; Walfrido de Leon, M.D.

Antonio Sison, M.D.; Agerico B.M. Sison, M.D.; Liborio Gomez, M.D. Ph.D.H.Lara, M.D. Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Manuel V. Arguelles, M.D..

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Nicanor G. Teodoro, Ph.D.;

Feliciano M. Clara, Ph.D., Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Heraclio R. Montalban, M.A.; Gonzalo Merino, Ph.D.;

Canuto G. Manuel, D.Sc. ;Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.; Faustino Q. Otanes, M.S.;

Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 84. No.4 December 1955

Published by the Institute of Science and Technology(Formerly Bureau of Science)

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.

A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; .W. Wade, M.D.; Walfrido de Leon, M.D.

Antonio Sison, M.D.; Agerico B.M. Sison, M.D.; Liborio Gomez, M.D. Ph.D.H.Lara, M.D. Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Manuel V. Arguelles, M.D..

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Nicanor G. Teodoro, Ph.D.;

Feliciano M. Clara, Ph.D., Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Heraclio R. Montalban, M.A.; Gonzalo Merino, Ph.D.;

Canuto G. Manuel, D.Sc. ;Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.; Faustino Q. Otanes, M.S.;

Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 83 January to December 1954

Published by the Institute of Science and Technology(Formerly Bureau of Science)

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.

A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Experimental Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; .W. Wade, M.D.;

Walfrido de Leon, M.D.

Clinical Medicine

Antonio Sison, M.D.; Agerico B. M. Sison, M.D. Liborio Gomez, M.D., Ph.D.; H. Lara, M.D.Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Nicanor G. Teodoro, Ph.D.;

Feliciano M. Clara, Ph.D., Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Heraclio R. Montalban, M.A.; Gonzalo Merino, Ph.D.;

Canuto G. Manuel, D.Sc. ;Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.; Faustino Q. Otanes, M.S.;

Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 82. January to December 1953

Published by the Institute of Science and Technology(Formerly Bureau of Science)

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.

A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

V. Elicaño, B.S.; Antonio D. Alvir, Ph.D.; Jose Feliciano, Ph.D.

Experimental Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; .W. Wade, M.D.;

Walfrido de Leon, M.D.

Clinical Medicine

Antonio Sison, M.D.; Agerico B. M. Sison, M.D. Liborio Gomez, M.D., Ph.D.; H. Lara, M.D.Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Nicanor G. Teodoro, Ph.D.;

Feliciano M. Clara, Ph.D., Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Heraclio R. Montalban, M.A.; Gonzalo Merino, Ph.D.;

Canuto G. Manuel, D.Sc. ;Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.; Faustino Q. Otanes, M.S.;

Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 81. No.1 March 1952

Published by the Institute of Science and Technology(Formerly Bureau of Science)

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.

A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

V. Elicaño, B.S.; Antonio D. Alvir, Ph.D.; Jose Feliciano, Ph.D.

Experimental Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; .W. Wade, M.D.;

Walfrido de Leon, M.D.

Clinical Medicine

Antonio Sison, M.D.; Agerico B. M. Sison, M.D. Liborio Gomez, M.D., Ph.D.; H. Lara, M.D.Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Nicanor G. Teodoro, Ph.D.;

Feliciano M. Clara, Ph.D., Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Heraclio R. Montalban, M.A.; Gonzalo Merino, Ph.D.;

Canuto G. Manuel, D.Sc. ;Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.; Faustino Q. Otanes, M.S.;

Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 81. No.1 March 1952

Published by the Institute of Science and Technology(Formerly Bureau of Science)

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.

A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

V. Elicaño, B.S.; Antonio D. Alvir, Ph.D.; Jose Feliciano, Ph.D.

Experimental Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; .W. Wade, M.D.;

Walfrido de Leon, M.D.

Clinical Medicine

Antonio Sison, M.D.; Agerico B. M. Sison, M.D. Liborio Gomez, M.D., Ph.D.; H. Lara, M.D.Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Nicanor G. Teodoro, Ph.D.;

Feliciano M. Clara, Ph.D., Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Heraclio R. Montalban, M.A.; Gonzalo Merino, Ph.D.;

Canuto G. Manuel, D.Sc. ;Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.; Faustino Q. Otanes, M.S.;

Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 80 No.3 September 1951

Published by the Institute of Science and Technology(Formerly Bureau of Science)

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E..; Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.

A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

V. Elicaño, B.S.; Antonio D. Alvir, Ph.D.; Jose Feliciano, Ph.D.

Experimental Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; .W. Wade, M.D.;

Walfrido de Leon, M.D.

Clinical Medicine

Antonio Sison, M.D.; Agerico B. M. Sison, M.D. Liborio Gomez, M.D., Ph.D.; H. Lara, M.D.Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Nicanor G. Teodoro, Ph.D.;

Feliciano M. Clara, Ph.D., Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Heraclio R. Montalban, M.A.; Gonzalo Merino, Ph.D.;

Canuto G. Manuel, D.Sc. ;Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.; Faustino Q. Otanes, M.S.;

Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 79 No.4 December 1950

Published by the Institute of Science (Formerly Bureau of Science)

A.S Arguelles, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.Joaquin Marañon, D.Sc.; R.H. Aguilar, Ch. E.

Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

V. Elicaño, B.S.; Antonio D. Alvir, Ph.D.; Jose Feliciano, Ph.D.

Experimental Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; Isabelo Conception, M.D.

H.W. Wade, M.D.; Walfrido de Leon, M.D.

Clinical Medicine

Antonio Sison, M.D.; Liborio Gomez, M.D., Ph.D. H. Lara, M.D.Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Rafael B. Espino, Ph.D.

Nicanor G. Teodoro, Ph.D.; Feliciano M. Clara, Ph.D. Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Heraclio R. Montalban, M.A.; Gonzalo Merino, Ph.D.;

Canuto G. Manuel, D.Sc. ;Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.; Faustino Q. Otanes, M.S.;

Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 78 No.2 September 1949

Published by the Institute of Science (Formerly Bureau of Science)

A.S Arguelles, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.Joaquin Marañon, D.Sc.; R.H. Aguilar, Ch. E.

Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

V. Elicaño, B.S.; Antonio D. Alvir, Ph.D.; Jose Feliciano, Ph.D.

Experimental Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; Isabelo Conception, M.D.

H.W. Wade, M.D.; Walfrido de Leon, M.D.

Clinical Medicine

Antonio Sison, M.D.; Liborio Gomez, M.D., Ph.D. H. Lara, M.D.Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Rafael B. Espino, Ph.D.

Nicanor G. Teodoro, Ph.D.; Feliciano M. Clara, Ph.D. Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Heraclio R. Montalban, M.A.; Gonzalo Merino, Ph.D.;

Canuto G. Manuel, D.Sc. ;Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.; Faustino Q. Otanes, M.S.;

Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 78 No.2 June 1949

Published by the Institute of Science (Formerly Bureau of Science)

A.S Arguelles, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.Joaquin Marañon, D.Sc.; R.H. Aguilar, Ch. E.

Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

V. Elicaño, B.S.; Antonio D. Alvir, Ph.D.; Jose Feliciano, Ph.D.

Experimental Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; Isabelo Conception, M.D.

H.W. Wade, M.D.; Walfrido de Leon, M.D.

Clinical Medicine

Antonio Sison, M.D.; Liborio Gomez, M.D., Ph.D. H. Lara, M.D.Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Rafael B. Espino, Ph.D.

Nicanor G. Teodoro, Ph.D.; Feliciano M. Clara, Ph.D. Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Marcos A. Tubangui, M.S., D.V.M.; Heraclio R. Montalban, M.A.

Gonzalo Merino, Ph.D.; Canuto G. Manuel, D.Sc.Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.

Faustino Q. Otanes, M.S.; Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 78 No.1 March 1949

Published by the Institute of Science (Formerly Bureau of Science)

A.S Arguelles, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.Joaquin Marañon, D.Sc.; R.H. Aguilar, Ch. E.

Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

V. Elicaño, B.S.; Antonio D. Alvir, Ph.D.; Jose Feliciano, Ph.D.

Experimental Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; Isabelo Conception, M.D.

H.W. Wade, M.D.; Walfrido de Leon, M.D.

Clinical Medicine

Antonio Sison, M.D.; Liborio Gomez, M.D., Ph.D. H. Lara, M.D.Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Rafael B. Espino, Ph.D.

Nicanor G. Teodoro, Ph.D.; Feliciano M. Clara, Ph.D.J.K. Santos, Ph.D.; Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Marcos A. Tubangui, M.S., D.V.M.; Heraclio R. Montalban, M.A.

Gonzalo Merino, Ph.D.; Canuto G. Manuel, D.Sc.Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.

Faustino Q. Otanes, M.S.; Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 87 No. 4 December 1958

National Science Development Board

Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.

Vice Chairman and Executive Director

Members of the Board

Teodoro Evangelista, LL.B., LL.D. Florencio A. Medina, M.S.Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Crisostomo Ortigas, M.S.M.EJoaquin Marañon, D.Sc. Antonio G. Sison, M.D.Gregorio Y. Zara, D.Sc.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Joaquin Marañon, D.Sc.Editor

Eduardo Quisumbing, Ph.D. Canuto G. Manuel, D.Sc. Associate Editor Associate Editor

Mauro Garcia, B.S.E.Copy Editor

Contributing Editors

Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.

Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.

Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.

Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. FelizaB.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.

Vol. 87 No. 3 September 1958

National Science Development Board

Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.

Vice Chairman and Executive Director

Members of the Board

Teodoro Evangelista, LL.B., LL.D. Florencio A. Medina, M.S.Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Crisostomo Ortigas, M.S.M.EJoaquin Marañon, D.Sc. Antonio G. Sison, M.D.Gregorio Y. Zara, D.Sc.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Joaquin Marañon, D.Sc.Editor

Eduardo Quisumbing, Ph.D. Canuto G. Manuel, D.Sc. Associate Editor Associate Editor

Mauro Garcia, B.S.E.Copy Editor

Contributing Editors

Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.

Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.

Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.

Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. FelizaB.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.

Vol. 87 No.1 March 1958

Published by the Institute of Science and Technology(Formerly Bureau of Science)

[Entered as second-class matter at the Post Office at Manila, Phillipines.]

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor (on leave)

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Anthropology

H.O. Beyer, M.A.;Robert B. Fox, Ph.D.; Ricardo E. Galang, M.A

Botany

Feliciano M. Clara, Ph.D.; E.B. Copeland Ph.D.; T.G. Fajardo, Ph.DA.F. Fischer, C.E., F.M.; Nemesio B. Mendiola, Ph.D

Nicanor G. Teodoro, Ph.D.

Chemistry

F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.; Marcos M. Alicante, Ph.D.Felix V. Espino, Ch.E.; Manuel L. Roxas, Ph.D.;

Patrocinio Valenzuela, Ph.D.

Geology

Leopoldo F. Abad, M.S.; Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Manuel V. Arguelles, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D. Hilario Lara, M.D.; Walfirdo De Leon, M.D.

Cristobal Manalang, M.D.; Daniel de la Paz, M.D.; Carmelo Reyes, M.D.Jose Rodriguez, M.D.; Agerico B. M. Sison, M.D.

Antonio Sison, M.D.; H.W. Wade, M.D..

Zoology

Leopoldo S. Clemente, Ph.D.; Canuto G. Manuel, D.Sc. Gonzalo Merino, Ph.D.; Heraclio R. Montalban, M.A.

Faustino Q. Otanes, M.S.; Manuel D. Sumulong, M.S., D.V.M.Leopoldo B. Uichanco, D.Sc.; Agustin F. Umali, B.S.

Deogracias V. Villadolid, Ph.D.; Lope M. Yutuc, D.V.M.

Vol. 86 No.4 December 1957

Published by the Institute of Science and Technology(Formerly Bureau of Science)

[Entered as second-class matter at the Post Office at Manila, Phillipines.]

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Anthropology

H.O. Beyer, M.A.;Robert B. Fox, Ph.D.; Ricardo E. Galang, M.A

Botany

Feliciano M. Clara, Ph.D.; E.B. Copeland Ph.D.; T.G. Fajardo, Ph.DA.F. Fischer, C.E., F.M.; Nemesio B. Mendiola, Ph.D

Nicanor G. Teodoro, Ph.D.

Chemistry

F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.; Marcos M. Alicante, Ph.D.Felix V. Espino, Ch.E.; Manuel L. Roxas, Ph.D.;

Patrocinio Valenzuela, Ph.D.

Geology

Leopoldo F. Abad, M.S.; Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Manuel V. Arguelles, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D. Hilario Lara, M.D.;Liborio Gomez, M.D.; Walfirdo De Leon, M.D.

Cristobal Manalang, M.D.; Daniel de la Paz, M.D.; Carmelo Reyes, M.D.Jose Rodriguez, M.D.; Agerico B. M. Sison, M.D.

Antonio Sison, M.D.; H.W. Wade, M.D..

Zoology

Leopoldo S. Clemente, Ph.D.; Canuto G. Manuel, D.Sc. Gonzalo Merino, Ph.D.; Heraclio R. Montalban, M.A.

Faustino Q. Otanes, M.S.; Manuel D. Sumulong, M.S., D.V.M.Leopoldo B. Uichanco, D.Sc.; Agustin F. Umali, B.S.

Deogracias V. Villadolid, Ph.D.; Lope M. Yutuc, D.V.M.

Vol. 86 No.3 September 1957

Published by the Institute of Science and Technology(Formerly Bureau of Science)

[Entered as second-class matter at the Post Office at Manila, Phillipines.]

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Anthropology

H.O. Beyer, M.A.;Robert B. Fox, Ph.D.; Ricardo E. Galang, M.A

Botany

Feliciano M. Clara, Ph.D.; E.B. Copeland Ph.D.; T.G. Fajardo, Ph.DA.F. Fischer, C.E., F.M.; Nemesio B. Mendiola, Ph.D

Nicanor G. Teodoro, Ph.D.

Chemistry

F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.; Marcos M. Alicante, Ph.D.Felix V. Espino, Ch.E.; Manuel L. Roxas, Ph.D.;

Patrocinio Valenzuela, Ph.D.

Geology

Leopoldo F. Abad, M.S.; Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Manuel V. Arguelles, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D. Hilario Lara, M.D.;Liborio Gomez, M.D.; Walfirdo De Leon, M.D.

Cristobal Manalang, M.D.; Daniel de la Paz, M.D.; Carmelo Reyes, M.D.Jose Rodriguez, M.D.; Agerico B. M. Sison, M.D.

Antonio Sison, M.D.; H.W. Wade, M.D..

Zoology

Leopoldo S. Clemente, Ph.D.; Canuto G. Manuel, D.Sc. Gonzalo Merino, Ph.D.; Heraclio R. Montalban, M.A.

Faustino Q. Otanes, M.S.; Manuel D. Sumulong, M.S., D.V.M.Leopoldo B. Uichanco, D.Sc.; Agustin F. Umali, B.S.

Deogracias V. Villadolid, Ph.D.; Lope M. Yutuc, D.V.M.

Vol. 86 No.2 June 1957

Published by the Institute of Science and Technology(Formerly Bureau of Science)

[Entered as second-class matter at the Post Office at Manila, Phillipines.]

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Anthropology

H.O. Beyer, M.A.;Robert B. Fox, Ph.D.; Ricardo E. Galang, M.A

Botany

Feliciano M. Clara, Ph.D.; E.B. Copeland Ph.D.; T.G. Fajardo, Ph.DA.F. Fischer, C.E., F.M.; Nemesio B. Mendiola, Ph.D

Nicanor G. Teodoro, Ph.D.

Chemistry

F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.; Marcos M. Alicante, Ph.D.Felix V. Espino, Ch.E.; Manuel L. Roxas, Ph.D.;

Patrocinio Valenzuela, Ph.D.

Geology

Leopoldo F. Abad, M.S.; Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Manuel V. Arguelles, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D. Hilario Lara, M.D.;Liborio Gomez, M.D.; Walfirdo De Leon, M.D.

Cristobal Manalang, M.D.; Daniel de la Paz, M.D.; Carmelo Reyes, M.D.Jose Rodriguez, M.D.; Agerico B. M. Sison, M.D.

Antonio Sison, M.D.; H.W. Wade, M.D..

Zoology

Leopoldo S. Clemente, Ph.D.; Canuto G. Manuel, D.Sc. Gonzalo Merino, Ph.D.; Heraclio R. Montalban, M.A.

Faustino Q. Otanes, M.S.; Manuel D. Sumulong, M.S., D.V.M.Leopoldo B. Uichanco, D.Sc.; Agustin F. Umali, B.S.

Deogracias V. Villadolid, Ph.D.; Lope M. Yutuc, D.V.M.

Vol. 86 No.1 March 1957

Published by the Institute of Science and Technology(Formerly Bureau of Science)

[Entered as second-class matter at the Post Office at Manila, Phillipines.]

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Anthropology

H.O. Beyer, M.A.;Robert B. Fox, Ph.D.; Ricardo E. Galang, M.A

Botany

Feliciano M. Clara, Ph.D.; E.B. Copeland Ph.D.; T.G. Fajardo, Ph.DA.F. Fischer, C.E., F.M.; Nemesio B. Mendiola, Ph.D

Nicanor G. Teodoro, Ph.D.

Chemistry

F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.; Marcos M. Alicante, Ph.D.Felix V. Espino, Ch.E.; Manuel L. Roxas, Ph.D.;

Patrocinio Valenzuela, Ph.D.

Geology

Leopoldo F. Abad, M.S.; Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Manuel V. Arguelles, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D. Hilario Lara, M.D.;Liborio Gomez, M.D.; Walfirdo De Leon, M.D.

Cristobal Manalang, M.D.; Daniel de la Paz, M.D.; Carmelo Reyes, M.D.Jose Rodriguez, M.D.; Agerico B. M. Sison, M.D.

Antonio Sison, M.D.; H.W. Wade, M.D..

Zoology

Leopoldo S. Clemente, Ph.D.; Canuto G. Manuel, D.Sc. Gonzalo Merino, Ph.D.; Heraclio R. Montalban, M.A.

Faustino Q. Otanes, M.S.; Manuel D. Sumulong, M.S., D.V.M.Leopoldo B. Uichanco, D.Sc.; Agustin F. Umali, B.S.

Deogracias V. Villadolid, Ph.D.; Lope M. Yutuc, D.V.M.

Vol. 85 No.4 December 1956

Published by the Institute of Science and Technology(Formerly Bureau of Science)

[Entered as second-class matter at the Post Office at Manila, Phillipines.]

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Anthropology

H.O. Beyer, M.A.;Robert B. Fox, Ph.D.; Ricardo E. Galang, M.A

Botany

Feliciano M. Clara, Ph.D.; E.B. Copeland Ph.D.; T.G. Fajardo, Ph.DA.F. Fischer, C.E., F.M.; Nemesio B. Mendiola, Ph.D

Nicanor G. Teodoro, Ph.D.

Chemistry

F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.; Marcos M. Alicante, Ph.D.Felix V. Espino, Ch.E.; A.J. Hermano, D.Sc.

Manuel L. Roxas, Ph.D.; Patrocinio Valenzuela, Ph.D.

Geology

Leopoldo F. Abad, M.S.; Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Manuel V. Arguelles, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D. Hilario Lara, M.D.;Liborio Gomez, M.D.; Walfirdo De Leon, M.D.

Cristobal Manalang, M.D.; Daniel de la Paz, M.D.; Carmelo Reyes, M.D.Jose Rodriguez, M.D.; Agerico B. M. Sison, M.D.

Antonio Sison, M.D.; H.W. Wade, M.D..

Zoology

Leopoldo S. Clemente, Ph.D.; Canuto G. Manuel, D.Sc. Gonzalo Merino, Ph.D.; Heraclio R. Montalban, M.A.

Faustino Q. Otanes, M.S.; Manuel D. Sumulong, M.S., D.V.M.Leopoldo B. Uichanco, D.Sc.; Agustin F. Umali, B.S.

Deogracias V. Villadolid, Ph.D.; Lope M. Yutuc, D.V.M.

Vol. 85 No.3 September 1956

Published by the Institute of Science and Technology(Formerly Bureau of Science)

[Entered as second-class matter at the Post Office at Manila, Phillipines.]

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Anthropology

H.O. Beyer, M.A.;Robert B. Fox, Ph.D.; Ricardo E. Galang, M.A

Botany

Feliciano M. Clara, Ph.D.; E.B. Copeland Ph.D.; T.G. Fajardo, Ph.D.A.F. Fischer, C.E., F.M.; Nemesio B. Mendiola, Ph.D.

Nicanor G. Teodoro, Ph.D.

Chemistry

F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.; Marcos M. Alicante, Ph.D.Felix V. Espino, Ch.E.; A.J. Hermano, D.Sc.

Manuel L. Roxas, Ph.D.; Patrocinio Valenzuela, Ph.D.

Geology

Leopoldo F. Abad, M.S.; Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Manuel V. Arguelles, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D. Hilario Lara, M.D.;Liborio Gomez, M.D.; Walfirdo De Leon, M.D.

Cristobal Manalang, M.D.; Daniel de la Paz, M.D.; Carmelo Reyes, M.D.Jose Rodriguez, M.D.; Agerico B. M. Sison, M.D.

Antonio Sison, M.D.; H.W. Wade, M.D..

Zoology

Leopoldo S. Clemente, Ph.D.; Canuto G. Manuel, D.Sc. Gonzalo Merino, Ph.D.; Heraclio R. Montalban, M.A.

Faustino Q. Otanes, M.S.; Manuel D. Sumulong, M.S., D.V.M.Leopoldo B. Uichanco, D.Sc.; Agustin F. Umali, B.S.

Deogracias V. Villadolid, Ph.D.; Lope M. Yutuc, D.V.M.

Vol. 85 No.2 June 1956

Published by the Institute of Science and Technology(Formerly Bureau of Science)

[Entered as second-class matter at the Post Office at Manila, Phillipines.]

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Anthropology

H.O. Beyer, M.A.;Robert B. Fox, Ph.D.; Ricardo E. Galang, M.A

Botany

Feliciano M. Clara, Ph.D.; E.B. Copeland Ph.D.; T.G. Fajardo, Ph.D.A.F. Fischer, C.E., F.M.; Nemesio B. Mendiola, Ph.D.

Nicanor G. Teodoro, Ph.D.

Chemistry

F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.; Marcos M. Alicante, Ph.D.Felix V. Espino, Ch.E.; A.J. Hermano, D.Sc.

Manuel L. Roxas, Ph.D.; Patrocinio Valenzuela, Ph.D.

Geology

Leopoldo F. Abad, M.S.; Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Manuel V. Arguelles, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D. Hilario Lara, M.D.; Liborio Gomez, M.D.; Walfirdo De Leon, M.D.

Cristobal Manalang, M.D.; Daniel de la Paz, M.D.; Carmelo Reyes, M.D.Jose Rodriguez, M.D.; Agerico B. M. Sison, M.D.

Antonio Sison, M.D.; H.W. Wade, M.D..

Zoology

Leopoldo S. Clemente, Ph.D.; Canuto G. Manuel, D.Sc. Gonzalo Merino, Ph.D.; Heraclio R. Montalban, M.A.

Faustino Q. Otanes, M.S.; Manuel D. Sumulong, M.S., D.V.M.Leopoldo B. Uichanco, D.Sc.; Agustin F. Umali, B.S.

Deogracias V. Villadolid, Ph.D.; Lope M. Yutuc, D.V.M.

Vol. 85 No.1 March 1956

Published by the Institute of Science and Technology(Formerly Bureau of Science)

[Entered as second-class matter at the Post Office at Manila, Phillipines.]

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Anthropology

H.O. Beyer, M.A.;Robert B. Fox, Ph.D.; Ricardo E. Galang, M.A

Botany

Feliciano M. Clara, Ph.D.; E.B. Copeland Ph.D.; T.G. Fajardo, Ph.D.A.F. Fischer, C.E., F.M.; Nemesio B. Mendiola, Ph.D.

Nicanor G. Teodoro, Ph.D.

Chemistry

F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.; Marcos M. Alicante, Ph.D.Felix V. Espino, Ch.E.; A.J. Hermano, D.Sc.

Manuel L. Roxas, Ph.D.; Patrocinio Valenzuela, Ph.D.

Geology

Leopoldo F. Abad, M.S.; Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Manuel V. Arguelles, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D. Hilario Lara, M.D.; Liborio Gomez, M.D.; Walfirdo De Leon, M.D.

Cristobal Manalang, M.D.; Daniel de la Paz, M.D.; Carmelo Reyes, M.D.Jose Rodriguez, M.D.; Agerico B. M. Sison, M.D.

Antonio Sison, M.D.; H.W. Wade, M.D..

Zoology

Leopoldo S. Clemente, Ph.D.; Canuto G. Manuel, D.Sc. Gonzalo Merino, Ph.D.; Heraclio R. Montalban, M.A.

Faustino Q. Otanes, M.S.; Manuel D. Sumulong, M.S., D.V.M.Leopoldo B. Uichanco, D.Sc.; Agustin F. Umali, B.S.

Deogracias V. Villadolid, Ph.D.; Lope M. Yutuc, D.V.M.

Vol. 84 January to December 1955

Published by the Institute of Science and Technology(Formerly Bureau of Science)

[Entered as second-class matter at the Post Office at Manila, Phillipines.]

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.

A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; .W. Wade, M.D.; Walfrido de Leon, M.D.

Antonio Sison, M.D.; Agerico B.M. Sison, M.D.; Liborio Gomez, M.D. Ph.D.H.Lara, M.D. Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Manuel V. Arguelles, M.D..

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Nicanor G. Teodoro, Ph.D.;

Feliciano M. Clara, Ph.D., Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Heraclio R. Montalban, M.A.; Gonzalo Merino, Ph.D.;

Canuto G. Manuel, D.Sc. ;Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.; Faustino Q. Otanes, M.S.;

Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 84. No.4 December 1955

Published by the Institute of Science and Technology(Formerly Bureau of Science)

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.

A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; .W. Wade, M.D.; Walfrido de Leon, M.D.

Antonio Sison, M.D.; Agerico B.M. Sison, M.D.; Liborio Gomez, M.D. Ph.D.H.Lara, M.D. Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Manuel V. Arguelles, M.D..

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Nicanor G. Teodoro, Ph.D.;

Feliciano M. Clara, Ph.D., Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Heraclio R. Montalban, M.A.; Gonzalo Merino, Ph.D.;

Canuto G. Manuel, D.Sc. ;Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.; Faustino Q. Otanes, M.S.;

Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 83 January to December 1954

Published by the Institute of Science and Technology(Formerly Bureau of Science)

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Mauro Garcia, B.S.E., Copy EditorAngel Y. Lira, B.S.C., Junior Copy Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.

A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

Victoriano Elicaño, B.S.; Antonio D. Alvir, Ph.D

Experimental Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; .W. Wade, M.D.;

Walfrido de Leon, M.D.

Clinical Medicine

Antonio Sison, M.D.; Agerico B. M. Sison, M.D. Liborio Gomez, M.D., Ph.D.; H. Lara, M.D.Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Nicanor G. Teodoro, Ph.D.;

Feliciano M. Clara, Ph.D., Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Heraclio R. Montalban, M.A.; Gonzalo Merino, Ph.D.;

Canuto G. Manuel, D.Sc. ;Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.; Faustino Q. Otanes, M.S.;

Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 82. January to December 1953

Published by the Institute of Science and Technology(Formerly Bureau of Science)

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.

A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

V. Elicaño, B.S.; Antonio D. Alvir, Ph.D.; Jose Feliciano, Ph.D.

Experimental Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; .W. Wade, M.D.;

Walfrido de Leon, M.D.

Clinical Medicine

Antonio Sison, M.D.; Agerico B. M. Sison, M.D. Liborio Gomez, M.D., Ph.D.; H. Lara, M.D.Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Nicanor G. Teodoro, Ph.D.;

Feliciano M. Clara, Ph.D., Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Heraclio R. Montalban, M.A.; Gonzalo Merino, Ph.D.;

Canuto G. Manuel, D.Sc. ;Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.; Faustino Q. Otanes, M.S.;

Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 81. No.1 March 1952

Published by the Institute of Science and Technology(Formerly Bureau of Science)

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.

A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

V. Elicaño, B.S.; Antonio D. Alvir, Ph.D.; Jose Feliciano, Ph.D.

Experimental Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; .W. Wade, M.D.;

Walfrido de Leon, M.D.

Clinical Medicine

Antonio Sison, M.D.; Agerico B. M. Sison, M.D. Liborio Gomez, M.D., Ph.D.; H. Lara, M.D.Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Nicanor G. Teodoro, Ph.D.;

Feliciano M. Clara, Ph.D., Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Heraclio R. Montalban, M.A.; Gonzalo Merino, Ph.D.;

Canuto G. Manuel, D.Sc. ;Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.; Faustino Q. Otanes, M.S.;

Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 81. No.1 March 1952

Published by the Institute of Science and Technology(Formerly Bureau of Science)

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E.Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.

A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

V. Elicaño, B.S.; Antonio D. Alvir, Ph.D.; Jose Feliciano, Ph.D.

Experimental Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; .W. Wade, M.D.;

Walfrido de Leon, M.D.

Clinical Medicine

Antonio Sison, M.D.; Agerico B. M. Sison, M.D. Liborio Gomez, M.D., Ph.D.; H. Lara, M.D.Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Nicanor G. Teodoro, Ph.D.;

Feliciano M. Clara, Ph.D., Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Heraclio R. Montalban, M.A.; Gonzalo Merino, Ph.D.;

Canuto G. Manuel, D.Sc. ;Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.; Faustino Q. Otanes, M.S.;

Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 80 No.3 September 1951

Published by the Institute of Science and Technology(Formerly Bureau of Science)

Joaquin Marañon, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.; R.H. Aguilar, Ch.E..; Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.

A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

V. Elicaño, B.S.; Antonio D. Alvir, Ph.D.; Jose Feliciano, Ph.D.

Experimental Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; .W. Wade, M.D.;

Walfrido de Leon, M.D.

Clinical Medicine

Antonio Sison, M.D.; Agerico B. M. Sison, M.D. Liborio Gomez, M.D., Ph.D.; H. Lara, M.D.Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Nicanor G. Teodoro, Ph.D.;

Feliciano M. Clara, Ph.D., Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Heraclio R. Montalban, M.A.; Gonzalo Merino, Ph.D.;

Canuto G. Manuel, D.Sc. ;Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.; Faustino Q. Otanes, M.S.;

Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 79 No.4 December 1950

Published by the Institute of Science (Formerly Bureau of Science)

A.S Arguelles, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.Joaquin Marañon, D.Sc.; R.H. Aguilar, Ch. E.

Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

V. Elicaño, B.S.; Antonio D. Alvir, Ph.D.; Jose Feliciano, Ph.D.

Experimental Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; Isabelo Conception, M.D.

H.W. Wade, M.D.; Walfrido de Leon, M.D.

Clinical Medicine

Antonio Sison, M.D.; Liborio Gomez, M.D., Ph.D. H. Lara, M.D.Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Rafael B. Espino, Ph.D.

Nicanor G. Teodoro, Ph.D.; Feliciano M. Clara, Ph.D. Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Heraclio R. Montalban, M.A.; Gonzalo Merino, Ph.D.;

Canuto G. Manuel, D.Sc. ;Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.; Faustino Q. Otanes, M.S.;

Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 78 No.2 September 1949

Published by the Institute of Science (Formerly Bureau of Science)

A.S Arguelles, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.Joaquin Marañon, D.Sc.; R.H. Aguilar, Ch. E.

Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

V. Elicaño, B.S.; Antonio D. Alvir, Ph.D.; Jose Feliciano, Ph.D.

Experimental Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; Isabelo Conception, M.D.

H.W. Wade, M.D.; Walfrido de Leon, M.D.

Clinical Medicine

Antonio Sison, M.D.; Liborio Gomez, M.D., Ph.D. H. Lara, M.D.Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Rafael B. Espino, Ph.D.

Nicanor G. Teodoro, Ph.D.; Feliciano M. Clara, Ph.D. Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Heraclio R. Montalban, M.A.; Gonzalo Merino, Ph.D.;

Canuto G. Manuel, D.Sc. ;Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.; Faustino Q. Otanes, M.S.;

Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 78 No.2 June 1949

Published by the Institute of Science (Formerly Bureau of Science)

A.S Arguelles, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.Joaquin Marañon, D.Sc.; R.H. Aguilar, Ch. E.

Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

V. Elicaño, B.S.; Antonio D. Alvir, Ph.D.; Jose Feliciano, Ph.D.

Experimental Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; Isabelo Conception, M.D.

H.W. Wade, M.D.; Walfrido de Leon, M.D.

Clinical Medicine

Antonio Sison, M.D.; Liborio Gomez, M.D., Ph.D. H. Lara, M.D.Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Rafael B. Espino, Ph.D.

Nicanor G. Teodoro, Ph.D.; Feliciano M. Clara, Ph.D. Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Marcos A. Tubangui, M.S., D.V.M.; Heraclio R. Montalban, M.A.

Gonzalo Merino, Ph.D.; Canuto G. Manuel, D.Sc.Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.

Faustino Q. Otanes, M.S.; Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

Vol. 78 No.1 March 1949

Published by the Institute of Science (Formerly Bureau of Science)

A.S Arguelles, D.Sc., EditorEduardo Quisumbing, Ph D., Associate Editor

Contributing Editors

Chemistry

Manuel L. Roxas, Ph. D.; F.T. Adriano, Ph.D.Joaquin Marañon, D.Sc.; R.H. Aguilar, Ch. E.

Patrocinio Valenzuela, Ph.D.; Marcos M. Alicante, Ph.D.A.J. Hermano, D.Sc.; Felix V. Espino, Ch.E.

Geology

V. Elicaño, B.S.; Antonio D. Alvir, Ph.D.; Jose Feliciano, Ph.D.

Experimental Medicine

Daniel De La Paz, M.D.; Arturo Garcia, M.D.; Onofre Garcia, M.D.Cristobal Manalang, M.D.; Isabelo Conception, M.D.

H.W. Wade, M.D.; Walfrido de Leon, M.D.

Clinical Medicine

Antonio Sison, M.D.; Liborio Gomez, M.D., Ph.D. H. Lara, M.D.Jose Rodriguez, M.D.; Carmelo Reyes, M.D.

Botany

Elmer D. Merrill, D.Sc.; E.B. Copeland, Ph.D.; A.F. Fischer, C.E., M.F.T.G. Fajardo, Ph.D.; Rafael B. Espino, Ph.D.

Nicanor G. Teodoro, Ph.D.; Feliciano M. Clara, Ph.D.J.K. Santos, Ph.D.; Nemesio B. Mendiola, Ph.D.

Zoology

Leopoldo B. Uichangco, D.Sc.; Deogracias V. Villadolid, Ph.D.Marcos A. Tubangui, M.S., D.V.M.; Heraclio R. Montalban, M.A.

Gonzalo Merino, Ph.D.; Canuto G. Manuel, D.Sc.Manuel D. Sumulong, M.S., D.V.M.; Lope M. Yutuc, D.V.M.

Faustino Q. Otanes, M.S.; Leopoldo S. Clemente, Ph.D.

Anthropology

H.O. Beyer, M.A.; Ricardo E. Galang, M.A

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