Back MatterSource: The Scientific Monthly, Vol. 59, No. 2 (Aug., 1944), pp. ix-xiiPublished by: American Association for the Advancement of ScienceStable URL: http://www.jstor.org/stable/18416 .

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THE SCIENTIFIC MONTHLY ix

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"Photographic Plates

for Use in

Spectroscopy and Astronomy" FIFTH EDITION

A new., fully revised edition of this well-known publication is available. In it are listed the

characteristics of the special plates for scientific work which are made in the Kodak Research Lab- oratories. There are over one hundred kinds of these plates, distributed among seven basic types of emulsion each carefully prepared to provide desirable combinations of speed, contrast, granu- larity, and resolving power. They are sensitized in various ways to permit photography in spectral regions ranging from the short-wave-length ultra- violet to the infrared at 12,OOOA.

A copy of the new edition of the booklet will be sent free upon request.

EASTMAN KODAK COMPANY Research Laboratories Roehester 4, N. Y.

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x THE SCIENTIFIC MONTHLY

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MICROSCOPE

1L,Fu-wE, N OE, BACTERIA

THE MICROSCOPE ceased to be a metallurgy, photography, and vi- toy and became a practical scien- sion. Lenses and prisms in instru- tific instrument when the brilliant ments of increased accuracy are the mind and clever fingers of Antony tools employed by these talented van Leeuwenhoek began exploring workers in industry, education and its possibilities. Soon thereafter, the armed forces. It has been Perkin- reports of his accurate observations Elmer's privilege to supply them of minute structures were baffling with many of these tools. his contemporaries. From the give-and-take of this ex-

By establishing the art of properly perience, Perkin-Elmer has devel- grinding and polishing double- oped new ideas and new production convex lenses, he obtained from a methods which will bring to post- simple microscope magnification as war analysis, control, inspection, great as i6o diameters. His other 26 and observation new refinements in microscopes ranged in magnification scientific optical instruments. from 40 to 133. Through these, his WHAT PERKIN-ELMER MAKES eyes were first to observe Infusoria, CusTom-buIltEptca MES Rotifers, and Bacteria. Custom-built optical instruments

Leeuwenhoek achieved his fame for industrial analysis, control, and by a rare combination of superior inspection. grinding, unique skill in dissecting New optical devices to solve and mounting objects, and remark- specific problems, such as the all- able powers of observation and de- purpose infra-red spectrometer. duction. Special elements such as fine

lenses, prisms, flats, photographic H I S DI S C IPLE S S TL L P ROB E objectives, interferometer plates,

THE UNKNOWN retardation plates, Cornu prisms, Today, the modern disciples of Rochon prisms, Nicol prisms.

Leeuwenhoek are combining accu- rate lens grinding and observational skill to probe the unknowns of \ bacteriology, astronomy, chemistry,

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....... . .... Li

_!7~~~ov

6~ ~ 3

Bearing up wiell

He's carrying quite a load but he's doing all right. And he's mighty grateful for your help --especially when Long Distance circuits are crowded.

Then the Long Distance operator may say - "Please limit your call to 5 minutes." Saving telephone time is important in wartime.

B E L L TE L E P H O N E SYSTEM M

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xii THE SCIENTIFIC MONTHLY

* TELEVISION RAYS-like human sight- cally "bouncing" television images from sta- do not "bend" far beyond the curvature of the tion to station. With such relays supplement- earth. They travel in a straight line to the ing a coaxial cable, programs could be wit- horizon-and from the horizon off into space. nessed simultaneously from coast to coast. In preparing television as a service to the Today RCA's research facilities are de-

> public, research has sought ways to extend voted to providing the Allied fighting forces m television's program service by radio relay- with the most efficient radio and electronic X ing from city to city. equipment available. Tomorrow, these same

A solution to this problem has been per- skills and energies will continue to serve fected by RCA engineers: the radio relay sta- America in developing and creating new and tion-capable of picking up and automati- finer peacetime products. A

' ~ ~ ~ ~ ~ ~ "

RCA leads the way in ~~~~~~ ~~~~~~~~~~ ~~~~radio-television-

_ _ ! phonographs-records ____________________________________l__________________________________l________________ -tubes-electronics

Listen to RCA's"The Music America Loves Best"-Saturdays, 7:30 p.m., E.W.T., Blue Network * Buy War Bonds every pay day *

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New . . . . ..

HACKH-GRANT Chemical Dictionary

57,000 Terms Defined 3rd Edition Thoroughly Revised

By JULIUS GRANT, M.SC., PH.D., F.R.I.C.

This is a reference book needed by every library today because of the wide- spread industrial expansion and many new developments in science. It is the latest authoritative dictionary published-a single volume, convenient to handle and moderately priced.

The plan of the book is-

to provide concise, intelligible definitions based on the latest research findings and current acceptations

to give a clear and precise account of the theories, rules and laws of chemistry

to describe accurately the elements, compounds, drugs, min- erals, vegetable and animal products

to list concisely the reactions, processes and methods to mention briefly the chemical apparatus, equipment and in-

struments to note the names of investigators who have built up the

science

The book includes the collateral vocabulary of physics, astrophysics, geology, mineralogy, botany, zoology, medicine, pharmacy and the pertinent jargon of industry, mining and commerce.

Of timely interest and value is the restatement and redefinition of each turn in simple language taking into account the latest concepts of the phenomena of science and connecting these phenomena with each other.

217 illustrations, many diagrams, tables, formulas, etc., are included in the new edition.

925 Pages, $12.00

THE BLAKISTON COMPANY P ____________________________Phladtelphila 5, Pa.

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THE GOBI DESERT THE OUTDOORSMAN'S By MILDRED CABLE with COOKBOOK

FRANCESCA FRENCH FRANCESCA FRENCH By ARTHUR H. CARHART

One of the best travel books published in a long tinme. Grub can make a1 hunting or fishing trip a suc-

Miss Cable and her comipanions mnade many cess or a failure. This book is for outdoorsmen journeys into the Gobi, the first being over the who want to cook for themselves and enjoy the old Silk Road of Marco I'olo. Miss Cable has results. Included with excellent recipes for an eye for details and a feeling for persons and atmosphere. She stays at Moslemn inns. She cooking meats, fish, stews, chowders, vegetables, describes the problemns of desert travel, clothes desserts and beverages are recipes for favorite aiid customns of the difTerent tribes, journeys by camp dishes of well-known outdoorsmen. moonlight into "the largest wilderness area oni the globe," desert plants, ruins and relics, the The author has drawn on his many years of Qazaq nomads in their felt tentts, the wild, free anrd hospitable Mongols, the desert cities-Bar- personal experience in preparing this book and kul in the hills, Turfan a thousand feet below lie solves food problems fromii those of the rough- sea level, Urumehi where no one stays who can est camping trips to the most luxurious. He get away. discusses the great variety of camp cooking

She was held prisonier in General Ma's Moslem equipment, the stoves, fires, and fuel. He tells revolt because he needed her m-edical aid. She , , d describes a Living Buddha; the Tiger Prince, how to determine the amount of necessary food intermediary between Ma and the Chinese; a glib and how to pack it. This book is a "miust" for m-erchant spy; a desert postmaster; an Aberdeen the kit of every outdoorsriaian. missionary, in the desert forty years. She and $1.95 her companions made warm friends and loved the desert.

2 mtaps, 48 photographs, $3.50 KNOWING THE WEATHER By T. MORRIS LONGSTRETH

MR TOMPKINS IN Illustrated with photographs

WONDERLAND After a thorough discussion of the forecaster's tools and the structure of the atmosphere, the author takes up the application of forecasting.

Professor Gamnowv, born in Odessa and now Cloud formations, wind pressure, temllperature, living in Washington, has made notable contri- rain and snow are weather signs that are clearly butions to modern nuclear physics, but cannot and simply explained. resist mixing in with his physics a certain fan- tastic humor. The result is a creation such as There is a chapter oia the different levels of Mr Tompkins, from whom the reader painlessly obtains a bowing acquaintance with the theories interest--for the man on the ground, the flier of inodern physics. and the Weather Bureau's scope. Very practical

Mr Tompkins is a prosaic little clerk in a big chapters include the non-recurrent phenomena, city bank. B3,ut when he falls asleep after laear- hurricanes, tornadoes, records of extremes, and ing three lectures on modern physics, he has so on. A glossary will be of particular help to somiie astounding adventures. A delightful tale the xmateur. that miakes amazingly clear the fundamental t $1.69 principles of relativity. Amusing illustrations.

-lts., $2.00) MIRACLES AHEAD!

MR TOMPKINS Better Living in the Postwar World EXPLORES THE ATOM By NORMAN V. CARLISLE and

FRANK B. LATHAM By GEORGE GAMOW

In this amnusing sequel to Mr Tomnpiins in This book gives the full picture of postwar 1ovdenland the reader, comafronted by atoms, l aivin as it wviii l)e for the average citizen in an

paiailesslv obtains at least a bowing acquaini- age of tvliation, electronics, and chemical won- tance with the theories of modern physics. ders.

$2.00 $2.75

The MACMILLAN COMPANY 60 Fifth Ave., New York 1 1 BOSTON CHICAGO ATLANTA DALLAS SAN FRANCISCO

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