Front Matter Source: The Scientific Monthly, Vol. 70, No. 3 (Mar., 1950), pp. i-viii Published by: American Association for the Advancement of Science Stable URL: http://www.jstor.org/stable/19965 . Accessed: 02/05/2014 00:00 Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at . http://www.jstor.org/page/info/about/policies/terms.jsp . JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact [email protected]. . American Association for the Advancement of Science is collaborating with JSTOR to digitize, preserve and extend access to The Scientific Monthly. http://www.jstor.org This content downloaded from 130.132.123.28 on Fri, 2 May 2014 00:00:42 AM All use subject to JSTOR Terms and Conditions
Transcript
Front MatterSource: The Scientific Monthly, Vol. 70, No. 3 (Mar., 1950), pp. i-viiiPublished by: American Association for the Advancement of ScienceStable URL: http://www.jstor.org/stable/19965 .
Accessed: 02/05/2014 00:00
Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at .http://www.jstor.org/page/info/about/policies/terms.jsp
.JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range ofcontent in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new formsof scholarship. For more information about JSTOR, please contact [email protected].
.
American Association for the Advancement of Science is collaborating with JSTOR to digitize, preserve andextend access to The Scientific Monthly.
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Protected by a wall of lead bricks and using a mirror to guide his instruments, this Bell Laboratories scientist is preparing a solution of a radioactive isotope, for use as a tracer to study materials for your telephone system.
Bombardment by neutrons turns some atoms of many chemical elements into their "radio- active isotopes"; these are unstable and give off radiation which can be detected by a Geiger counter. Chemically a "radioactive isotope" behaves exactly like the original element. Mix the two in a solution or an alloy and they will stay together; when the Geiger counter shows up an isotope, its inactive brother will be there too. Minute amounts beyond the reach of ordinary chemical methods can be detected- often as little as one part in a billion.
The method is uised to study the effect of composition on the performance of newly de- veloped germanium transistors-tiny amplifiers which may one day perform many functions which now require vacuum tubes.
It enables scientists at Bell Telephone Lab- oratories to observe the behavior of micro- scopic impurities which affect the emission of electrons from vacuum tube cathodes. It is of great help in observing wear on relay contacts. 'And it may develop into a useful tool for measuring the distribution and penetration of preservatives in wood.
Thus, one of science's newest techniques is adopted by Bell Laboratories to make your telephone serve you better today and better still tomorrow.
i BELL TELEPHONE LABORATORIES ( EXPLORING AND IN VENTING, DEVISING AND PERFECTING,
/ - FOR CONTINUED IMPRO VEMENTS AND ECONOMIES IN TELEPHONE SER VICE
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DeRobertis, Nowinski and Saez on General Cytology
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Book Reviews by R. W. Gerard, Chapman Grant, Paul R. Heyl, Edward A. Preble, Michael B. Shimkin, Marjorie B. Snyder, Julian H. Steward, and A. L. Strand . . . 206
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NAME(MrsDret.) this coupon E (Mrs., Dr., etc.). POSITION.
Now ADDRESS. .
NOMINATED BY.
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GENERAL CHEMISTRY. New second edition By JOHN A. TIMm, Simmons College. International Chemical Series. In press
By the addition of new material and more detailed treatment of reactions important to the study of qualitative analysis in the laboratory, this successful college text places relatively greater emphasis on the descriptive chem- istry of elements and their compounds. As before the book still retains a comprehensive discussion of matter and the forces acting between structure particles.
THE NATURE OF PHYSICAL REALITY. Philosophy of Modern Physics By HENRY MARGENAU, Yale University. In press
A discussion by a distinguished physicist of the philosophical implications of imodern scienee, wlhieh places the problems of physics in a philosophical setting and rounds out these problems until their significaniee is clear. The book covers recent advances aiid current problems, as well as many topics of additional importance.
THE ADVANCED ATLAS OF MODERN GEOiGRAPHY By JOHN BARTHOLOMEW, Director, The Geographical Inistitute, Edinburgh. In press
This new atlas by anl outstanding cartographer covers the world region by region. The mnaps are prinmarily physi- ographic although all the latest political boundaries are shown. In addition to this regional coverage other factors are also treated, such as cliniate, oceanography, ethnography, religion, language, cephalic index, skin color, geo- morphology, geology, soils, agriculture regions, vegetation, population density, routes of com-merce, etc.
BOTANY. A Textbook for Colleges. New 2nd edition By J. BEN HILL, Pennsylvania State College; LEE 0. OVERHOLTS, and HENRY r. Popp, Pennsylvania State
College. McGraw-Hill Putblications in the Botanical Sciences. 690 pages, $5.00
This book has been revised carefully in order to record advances in the field in recent years and to eliminate short- comings revealed by teaching of the original edition. This revised edition treats recent advances in the science in photosynthesis, respiration, fermentation and enzymes, metabolism, hormones and vitamins, antibiotics, the use of "tagged elements", hydroponics, etc. New sections have been added on viruses, actinomyeetes, diatoms, the eco- nomic importaniee of fungi as well as a special section on meiosis which is probably unique in general textbooks of botany.
AN INTRODUCTION TO PLANT PHYSIOLOGY By OTIS F. CURTIS; ancd DANIEL G. CLARK, Cornell University. 712 pages, $6.50
Develops the basic principles of plant physiology and shows the bearing of these prilnciples on the behaviors of plants under natural or controlled conditions. The result of twenty-five years of actual experimentation, the book emphasizes the practical application of theoretical principles.
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McGRAW-HILL BOOK COMPANY, INC. 330 WEST 42ND STREET, NEW YORK 18, N. Y.
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