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CONTENTS OF VOLUMES I AND IIE. SKAU and H. WAKEHAM, Determination of Melting and Freezing Temperatures-W. SWIETOSLAWSKI, Determination of Boiling and Condensation Temperatures-N.BAUER, Determination of Density-R. D. VOLD and M. VOLD, Determination ofSolubility-H. MARK, Determination of Viscosity-W. D. HARKINS, Determinationof Surface and Interfacial Tension-G. W. THOMSON, Parachor-W. D. HARKINS,Determination of Properties of Monolayers and Duplex Films-R. H. WAGNER, De-termination of Osmotic Pressure-A. L. GEDDES, Determination of Diffusivity-J.STURTEVANT, Calorimetry-E. E. JELLEY, Microscopy--M. A. PEACOCK, De-termination of Crystal Form-J. D. H. DONNAY, Crystallochemical Analysis-I.FANKUCHEN, X-Ray Diffraction-L. 0. BROCKWAY, Electron Diffraction-N.BAUER and K. FAJANS, Refractometry-W. WEST, Spectroscopy and Spectrophotom-etry-W. WEST, Colorimetry, Photometric Analysis, and Fluorimetry-W. HELLER,Polarimetry-C. P. SMYTH, Determination of Dipole Moments-T. SHEDLOVSKY,Conductometry-L. MICHAELIS, Potentiometry-O. H. MUELLER, Polarography-L.MICHAELIS, Determination of Magnetic Susceptibility-W. F. BALE and J. BONNER,Determination of Radioactivity-D. W. STEWART, Mass Spectrometry.

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Soundly Constructed

Write for complete specificationson anatomy, botany and

zoology models.

DENOYER-GEPPERTCOMPANY5235 Ravenswood Avenue

Chicago 40, Ill.

Index to AdvertisersName Page

American Council in Public Affairs ...... Cover 2

American Optical Company ........................ Cover 4

Bausch & Lomb Optical Company ............................ 571

Bell Telephone Laboratories ............................ 4

Biochemical Laboratories ............................ 19

Carnegie Institution of Washington ... 14

The Jaques Cattell Press ............................ 14

The Chronica Botanica Company ......... Cover 2

Classified AdvertisingTheMarket Place ........... ................. 19

Personnel Placement ............................ 18

Clay-Adams Company, Inc .................. 6

The Coleman & Bell Company ............................ 15

Corning Glass Works .......... ..................8Cranbrook Institute of Science ............................ 14Denoyer-Geppert Company ............................ 20Difco Laboratories ............ ................ 20

EastmanKodakCompany ............................ Cover3Interscience Publishers, Inc........................... 9Klett Manufacturing Company ............................ 16LaMotte Chemical Products Company ............... 19

Linguaphone Institute ............. ............... 17MeGraw-HillBook Company ............................ 13

TheMearl Corporation ............. ............... 6TheC.V.Mosby Company .................... ........ 11

New York Scientific Supply Company ............... 17Photovolt Corporation ............. ............... 17

Princeton University Press ............................ 573Rinehart&Company, Inc ... ......................... 10

W. B. SaundersCompany ..........................;.

Schleicher & Schuell Compiany ......................... 19SchwarzLaboratories, Inc..........................6

The Scientific Forum ........ ................. 19Sparkler Manufacturing Company ........................ 16

Eric .........................

TheTechnicon Company .............7............ 7ArthurH.Thomas Company .......................... 6

D. VanNostrandCompany, Ine............................... 15

John Wiley Sons, Inc ..........................

Wyeth,Inc..................................3

1

20 Vol. 103, No. 2679

Seizsitivity

you could/ notfget

55b/fore

Electrocardiograph trace made onKodak Recording Paper 1115

New Kodak Paper multiplies efifectiveness ofphotographic recording equipment

Kodak Recording Paper 1115, ortho-chromatic for increased sensitivity, KODAK RECORDING PAPER 1115

answers the demand for a faster re- Sensitivity-Orthochromaticcording paper and improved trace Surface-Glossyclarity in electrocardiography with Recommended Developerslow-intensity light illumination. Kodak Developer for Indus-

trial Recording Papers, oneThis new product of Kodak's long minute at 680 F; Qr Kodak

experience with photographic papers X-ray Developer, four min-permit fastr., mre accrate nter-utes at 680 F; or Kodakpermits fastr, more accrate inter-Dektol, one minute at 680 F.

pretation of electrocardiograph traces. Recommended Safelight-It is obtainable through your regular Wratten Series No. 2KCodak dealer. _____________

Eastmian Kodak CompanyRochester 4, New York

Adaptability has made theSpencer No. 33, one of theworld's most widely used micro-scopes. A comprehensive rangeof optical equipment and ac-cessories for measuring, count-ing, dark field, or vertical illum-ination makes this instrumentadaptable to practically every

branch of Science and Industry.Forcomplete information about

the Spencer No. 33 Microscopewrite dept. E i.

American w OpticalScientific Instrument Division

Buffalo 15, New York

i j

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PHYSICAL METHODS ORGANIC CHEMISTRY - …...A comprehensive treatise covering the entire field of piezoelectric theory and its principal applications. Electronics in Industry By GEORGE