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* A new text with unexcelled line drawings and photographs 7 6e * by WASLEY S. KROGDAHL Northwestern University This distinctive text emphasizes how astronomical knowledge is acquired with special stress placed on the use of the scientific method in discovering the behavior and history of the astronomical universe. As for the teachability of the book, read the following excerpt taken from a letter sent in by Dr. Edwin F. Carpenter, Steward Observatory University of Arizona. ".... We shall use the book this year in our introductory course for upper-class students. Your precise and concise, yet vivid style, and the complete absence of 'writing-down' to the students seem to me to constitute strong qualifications for this adoption. In addition, the topical arrangement is close to what I have been using for some time. But the opening with gravitational motion will be a novel experience for me, and I think an interesting one." * 598 pages $6.25 THE MACMILLAN COMPANY 60 Fifth Avenue New York 11 August 8. 1952 9 August 8,' 1952 9

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Page 1: new unexcelled line photographsscience.sciencemag.org/content/sci/116/3006/local/back... · 2005-07-11 · *Anew text with unexcelled line drawings and photographs 76e * by WASLEYS

* A new text with unexcelled

line drawings and photographs

7 6e

*

by WASLEY S. KROGDAHLNorthwestern University

This distinctive text emphasizes how astronomical knowledge isacquired with special stress placed on the use of the scientificmethod in discovering the behavior and history of the astronomicaluniverse. As for the teachability of the book, read the followingexcerpt taken from a letter sent in by Dr. Edwin F. Carpenter,Steward Observatory University of Arizona.

".... We shall use the book this year in our introductory course

for upper-class students. Your precise and concise, yet vividstyle, and the complete absence of 'writing-down' to the studentsseem to me to constitute strong qualifications for this adoption. Inaddition, the topical arrangement is close to what I have been usingfor some time. But the opening with gravitational motion will be a

novel experience for me, and I think an interesting one."

* 598 pages $6.25

THE MACMILLAN COMPANY 60 Fifth Avenue New York 11

August 8. 1952 9August 8,' 1952 9

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CA]IN'

RARE CHEMICALS OF HIGH PURITYTO SUPPLY THE NEEDS OF BIOCHEMICAL RESEARCH

Detailed, Pertinent, Analytical Data For Every Product

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Sodium w-MethylpantothenateD & L-Homocystine D-CystineD & L-Homocysteine Thiolactone DL-HydroxylysineD & L-Methionine L-ThiolhistidineD & L-Ethionine L-ErgothionineD & L-Serine Glycylglycine

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PARAF ILAA the versatilethermoplastic filmParafilm is a flexible, thermoplastic, highlywaterproof sheet material. It is transparent,practically colorless, odorless and tasteless.Parafilm is resistant to air, gases, alcohol,common acids and alkalis of moderate con-centration. It may be repeatedly folded,twisted and drawn around sharp surfaceswithout rupturing. It forms a perfect sealguarding against moisture loss and absorption.Parafilm is the perfect covering for culturetubes, broth tubes, Petri dishes or flasks. It isan ideal medium for mounting on cloth,wood, glass or metal.Parafilm is self-sealing. It strips off surfacesreadily leaving no residue to be washed or

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25 ft. roll ...... $3.20150 ft. roll ...... 12.50

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August 8, 1952

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PHOTOVOLTLine-Operated ElectronicMULTIPLIER-PHOTOMETER

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For the e-xact measurementof extremely low light valuesdown to 1/10,000 microlumen.

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August 8, 1952 13~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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A LONG-AWAITED ITEMTHIS new Bird Infusion Pump will meter accuratelyand continually small quantities of selected liquids, elimi-nating necessity of constant observation and refilling ofsyringes.The close regulation of flow will save you considerable in-jection fluid, and you will find a smaller number of repeatlaboratory experiments required. Operates on 115V,60 cy.

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6

13August 8, 1952

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Large stage moves up anddown for finer, faster focusing.

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IVITH this ideal permanent set-up you're instantly readyfor any visual or photomicrographic wvork. Just clamp micro-scope and illuminator to the AO Photomnicrographic Camerabase. A Special light-tigh-t adapter and camera arm wvith fineadjustment positioning stop enable you to swing the camera

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