Back MatterSource: The Scientific Monthly, Vol. 70, No. 1 (Jan., 1950), pp. vii-viiiPublished by: American Association for the Advancement of ScienceStable URL: http://www.jstor.org/stable/20066 .

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With television you see beyond the horizon. Radio brings you sounds from around the world. Electron microscopes peer deep into an infinitesimal world.

These, and other "leaves" on our new tree of knowledge are rooted in creative research-as carried out at RCA. Laboratories in Priniceton, N. J. lhere, research scientists seek new scientific prin- ciples, improve on old ones, or put them to new uses.

Already on their achievement list are hundreds of basic developments in electronics, television, radio, loran, electron tubes, radar, and recorded music. RCA research works continually to give you better products.

Examples now working for you include: Today's sharp-eyed Image Orthicon television cam- eras, television picture tubes, com- pact portable radios made possible by tiny electron tubes, the 45 rpm record-playing system with the fastest record changer ever de- vised and distortion-free records.

Research in your behalf: Creative research into new principles is an- other way in which RCA Labora- tories work to improve your way of living. Leadership in science and engineering adds value be- yond price to any product or serv- ice of RCA and RCA Victor. Examples of the newest advances in radio, television, and electronics-in action -may be seen at RCA Exhibition Hall, 36 West 49th Street, N. Y. Ad- nmission is fr-ee. Radio Corporation of America, Radio City, N. Y. 20.

RtAAD@ COARAPOARA 7ON oF AMRAfCA fr k1/or/da /Ieader i'n Re7d2 -r 1r/5n A7/ev,1s/'n

vii

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U ~ ~~~~TI-i iglucose, labieled with radiocarbon. If

f ~~~~~you know what thazt Is you're qualified to be a

^%Wfi ~reader of Science, the professional scientist's own weekly

magazine.

A little over a decade ago, the radioisotope was almost the personal property of the

chemist and physicist and other scientists rarely found a reference to it in their own spe-

cialized journals. But every scientist should have been reading about it then, because today

it is one of the principal tools of the biologist, the cancer research worker, the geolo-

gist, and even the agriculturalist.

Science cuts across all fields of science and interprets each one to the others.

It is the indispensable journal of any working scientist-both for reporting his own re-

search to a wide audience and for keeping him informed about what others are doing.

It is indispensable to the science writer who wants original sources.

It is indispensable to the student who wants to learn science in the making.

* It should be indispensable to you.

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viii

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record-lakiHg problems... and how photography helps solve them *..with savings

SOLUTION: Make photocopies with Kodagraph Contact Paper. I Anyone, with simple equipment, can easily make accurate, lasting photocopies of reports and papers. I Kodagraph Contact Paper is dura- ble, uniform in quality. Developed specifically for use with existing contact photocopy machines, it has wide latitude ... it assures clean, crisp copies of unsurpassed legibility. I

Photocopies save the costs of copying by I

haiid... aznd inisure absolute accuracy. I

at low 1os wihKd rp P..........e.i.....

SOLUIION: Make photogr-aphic du- plicates in one printing on Koda- graph Autopositive Paper, and get I file prints or intermediates that will I stand the wear and tear of handling and machine feed-throughs . . . that won't yellow, smudge, or fade. Koda- I graph Autopositive Paper can be handled in ordinary room light, and I can be exposed on familiar direct- process or blueprint equipment.

Photographic inztermediates mzake better prints ... and save your originals. I

iterme.s K n I

BAutop. i ti Pae........ ..

SOLUTION: Put inactive records on microfilm, destroy the obsolete originals, and use the file space so obtained for newer records. Micro- filming can reduce the bulk of files by as much as 98%-a sensational saving in space. Record your smaller papers, your larger documents and drawings with Kodagraph Micro- File Machines and Recordak equip- ment and service.

Microfilniuig pr-otects your recorcls, keeps them in order... andsaves space.

Space savings up to 98%

thog KIarp and Recorda microilmn

Photography reproduces detail exactly, com- INDUSTRIAL PHOTOGRAPHIC DIVISION pletely-even improves quality; photography pre- I ESTMR 4, N. YG serves-and, if you wish, condenses or enlarges. P sn me ma It can help yotu lower costs, increase efficiency, I Please send me more information about speed operations ... in laboratory, factory, office. I El better photocopies O better distribution prints

I i microfilming to save file space FUNCTIONAL PHOTOGRAPHY NAME __

DEPARTMENT_______________________ serves scientific and COMPAN_____ industrial progress COMPANY

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Medical Microscopes

for reater accuracy * , M~~odel BS 48/77

easier operation

Model With all the precision and quality GO 48/77 traditionally associated with the name

'Leitz, these improved Medical Microscopes embody the latest advancements optical.science can provide. Stands

are larger, yet lighter, with a longer bearing surface for the focusing motion. Both coarse and fine adjustment are easier working, offer greatest accuracy yet devised. Ne*k, built-in mechanical stage with low-set drives on a common axis, traversing area 3" x 2", means. easier, smoother opera- tion. New substage condenser with swing-out upper element permits the use of all lenses from lowest to highest magnifications. The oil immersion lens 1/12th, N.A. 1.30, 100x is anti-reflection coated for maximum definition and better color rendition.

Before you choose, ask your Leitz Dealer for a demonstration of the new Leitz Medical Microscopes.

Write today for Catalog Micro- 101 SM

E. LEITZ, Inc., 304 Hudson St., New York 13, N. Y.

LEITZ MICROSCOPES * BINOCULARS 4 SCIENTIFIC INSTRUMENTS LEICA CAMERAS AND ACCESSORIES

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