SCIENCEJANUARY 7, 1949

I PRESIDENT OF THE AAAS, 1949:ELVIN CHARLES STAKMANELVIN HELEN HART

RESEARCH AND THE DEVELOPMENT OFATOMIC ENERGY IROBERT F. BACHER f

CHROMOSOMES, GENES, AND THEELECTRON MICROSCOPE

DANIEL C. PEASE AND RICHARD F. BAKER

TECHNICAL PAPERS ICOMMENTS & COMMUNICATIONSI

IN MEMORIAMBOOK REVIEWS

NEWS AND NOTES

I COMPLETE TABLE OF CONTENTS ON PAGE 3 1

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DEROBERTIS, NOWINSKI & SAEZ' CYTOLOGYThese authors stress the morphological, physiological and genetic aspects of moderncytology. Reflecting the modern approach so evident throughout the text, is the cor-relation of methods derived from related sciences such as physics and biochemistry.Particular effort has been made to confine the discussion to established facts, thus safe-guarding the student from the confusion that so often arises when obliged to delve intocontroversial issues. The need for such a text is confirmed by the immediate ac-ceptance it has received.By E. D. P. DEROB~RTIS, M.D., Department of Biology, Massachusetts Institute of Technology; W. W. Now-INSKI, PH.D., Tissue Culture Laboratory and Department of Neurology and Psychiatry, University of TexasMedical Branch, Galveston; and F~NcIsco A. SAo. PH.D., Institute for the Investigation of Biological Sci-ences, Montevideo. 345 pages, with 143 Illustrations. some In color. $5.50

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the Creeping Sleeve

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BELL TE LE PH O N E LAB O RAT O R I ESEXPLORING AND INVENTING, DEVISING AND PERFECTING, FOR CON-

TINUED IMPROVEMENTS AND ECONOMIES IN TELEPHONE SERVICE.

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SCIENCEVol. 109 No. 2819 Friday, January 7, 1949

AAAS EDITORIAL BOARD(Terms expire July 31, 1949)

Arthur BevanEdward CondonBentley GlassMalcolm SouleEverett WallisGeorge BaitsellEditor-in-Chief

Advertising RepresentativeF. A. Moulton

CONTENTS

Special ArticlesElvin Charles Stakman: President of

AAAS, 1949: HelenHart ....................................

Research and the Development ofAtomic Energy: Robert F. Bacher

Preliminary Investigations of Chromo-somes and Genes With the ElectronMicroscope: Daniel C. Pease and

Richard F.Baker..............................................................

Technical PapersEffect of Absorber Position on Counting Rate

of Collimated and Uncollimiated Beta andGamma Radiation:Francis Johnston and John E. Willard ............

Oxidation of Parenterally Administered C14-labeled Tripalmitin Emulsions:

S. R.Lerner, et al.................................................................Life Cycle of Postharmostomum laruei Me-

Intosh 1934 (Trematoda: Brachylaemidae):Martin J. Ulm er.......................................................................

Distribution of Free Amino Acids in MouseEpidermis in Various Phases of Growth asDetermined by Paper Partition Chromatog-raphy: Eugene Roberts and

GarsonH .Tishkoff ...........................................................

Blocking Action of Tetraethylammonium onAxon Reflexes in the Human Skin:Henry Janowitz and M. I. Grossman .............

1 Further Consideration of a Suggested SimpleLaboratory Test for Poliomyelitis Virus:Pierre R. Lepine, Alex J. Steigman and

2 Albert B. Sabin .

Comments and CommunicationsA Note on "Why Vegetation on Watersheds?";

Antigen Films and Long-Range Forces; Pre-cedence of Modern Plant Names Over NamesBased on Fossils?; The Human EngineeringSeminar at New York University ......................... ..

In MemoriamRichard Chace Tolinan: Vannevar Bush.

Book Reviews11 Cancer, I, Her&dite, hormones, substances can-

cerigenes: J. Maisin.ReviewedbyF.Duran-Reynals ...........................

Outlines of physical chemistry:13 Farrington Daniels.

Reviewed by Raymond M. Fuoss ......................North American trees (exclusive of Mexico and

13 tropical United States):Richard J. Preston, Jr.

Reviewedby M. A. Huberman ...........................

Scientific Book Register.14 News and Notes.

Science, a weekly journal founded in 1880. is publishedeach Friday by the American Association for the Advance-ment of Science at the Business Press, 10 McGovern Ave.,Lancaster, Pa. Editorial and Advertising Offices, 1515 Massa-chusetts Ave., N.W., Washington 5, D. C. Telephone, Execu-tive 6060. Cable address, SCIMAG, Washington. D. C.Entered as second-class matter at the Post Office at Lancaster,Pa., January 13, 1948, under the Act of March 3, 1879. Ac-ceptance for mailing at the special rate of postage providedfor in the Act of February 28, 1925, embodied in Paragraph 4,Sec. 538, P.L. and R., authorized January 13, 1948. Applica-tion for additional entry at Washington, D. C., pending.

Manuscripts submitted for publication should be sent to theEditorial Office, with stamped, self-addressed envelope enclosedfor possible return. The AAAS assumes no responsibility forthe safety of the manuscripts or for the opinions expressedby contributors.Annual subscription, $7.50; single copies, $.25: foreign

postage, outside the Pan-American Union, $1.00: Canadian

postage, $.50. Remittances and orders for subscriptions andsingle copies should be sent to the Circulation Department,Science, 1515 Massachusetts Ave., N.W., Washington 5. D. C.Membership correspondence for the AAAS should be addressedto the Administrative Secretary at the same address.

Chance of address. Four weeks' notice is required forchange of address. This should be sent to Science Recorder,1515 Massachusetts Ave., N.W., Washington 5, D. C. Whenordering a change, it is necessary to furnish an address stencillabel from a recent issue. Claims for a missing number willnot be allowed if received more than 60 days from date ofissue. No claims allowed from subscribers due to failure tonotify the Circulation Department of a change of addres orbecause an issue is missing from their files, or for any reasonfrom subscribers in Central Europe, Asia, or the Pacific Islands(other than Hawaii).

The AAAS also publishes The Scientific Monthly. Subscrip-tion rates on request.

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