Kodak reports to laboratories on:refluxing fats ... the sensibleness of supplying somewhat impure organics ... makingthe selection of scientiflc photographic materials easier for you and us

Fats for feedAdvertising, not the kind you arereading now but the big-time out-pourings, convinces millions of la-dies that plain soap is demode, thatsynthetic detergents are the thing.Frantic scrabbling ensues to find amarket for the 700 million poundsof tallow and grease by which thenation's production exceeds its con-sumption. Agencies and institutionsconcerned with our agriculturalwelfare conceive the notion of theentire animal industry as a vastchemical operation in which the lessdesired product-fat-may be re-fluxed to create more of the desiredproduct-meat. A long series of nu-tritional experiments shows that it'smere folklore to regard herbivoresas creatures that eat vegetable ma-terials only. The reflux or feedbackidea, besides sounding highly scien-tific, also fits in with the farmer'sinstinctive desire for self-sufficiency.The statistics are impressive: if

only one percent of all feeds soldcontained 5 to 8 percent of stabi-lized animal fat, the farmers woulduse up all the fat they can't sellfor soap.Now, we learn that at the Uni-

versity of Nebraska, they have "fedout" one lot of steers on standardrations and an equivalent lot on amixture including tallow. Both lotsbrought the same price, but the fateaters had a glossier appearance andcost $1.18 less per cwt gain. Experi-ments elsewhere with chicken feedscontaining up to 8 percent stabilizedanimal fats have produced chickensindistinguishable from those onstandard diets.

"Stabilized" brings us to our part.Fat goes rancid in feed with com-mercially inconvenient rapidity,making it unappetizing to animalsand possibly dangerous to them."Tenox R," our butylated hydroxy-anisole, added in minute amountduring rendering, keeps the fat un-altered in mixed feeds for at leastone year's storage at room tempera-ture. Since we don't know of a bet-ter way to stabilize fats in feeds, the

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Motley amylbenzenesMost Eastman Organic Chemicalsare what we call Eastman Grade.By that we mean chemicals of suf-ficient purity for reagent use andfor the more exacting syntheses. Wealso list many items of PracticalGrade, and beneath that level thereare the items of Technical Grade.We wish to make the point here thatthe latter can sometimes make themost -sense.A typical Technical Grade East-

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Eastman, Practical, and Technical-there are more than 3500 Eastman Or-ganic Chemicals awaiting the discretionofthejudicious. Catalog on requestfromDistillation Products Indistries, East-man Organic Chemicals Department,Rochester 3, N. Y. (Division ofEastmanKodak Company).

CatalogThere is a tradition in our sales de-partment to encourage correspond-ence on business that looks like smallpotatoes to the average cost account-ant. Unaware of the historical rela-tionship between us and the scien-tific user of photographic materials,he might well question the exchangeof two or three long letters leading-up to a recommendation that anorder be placed with a dealer forone dozen 1" x 3" Kodak Autora-diographic Plates, Type No-Screen,retailing at $2.15.Noble as this outlook may be, we

are now making an attempt to savetime and stationery for the scientistand ourselves through the mediumof a booklet that summarizes thefacts about the various materials,familiar and obscure, which we offerfor scientific photography. If it doesnothing else, it should at least sug-gest useful questions to ask.Covered are our offerings in the

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Booksin

Chemistry

by Flory, Robertson& Ingold

PRINCIPLES OF POLYMER CHEMISTRY

By Paul J. Flory, Cornell University

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1953. 688 pages, 146 figures, 43 tables. $8.50

ORGANIC CRYSTALS AND MOLECULES

Theory of X-Ray Structure Analysis withApplications to Organic ChemistryBy J. Monteath Robertson, University of Glasgow"The reviewer enthusiastically recommends thebook to anyone interested in learning either aboutmodern methods of crystal structure analysis orabout the results of such analysis in the field oforganic compounds."--Journal of Chemical Edu-cation

1953. 351 pages, 132 illustrations. $5.00

STRUCTURE AND MECHANISM IN ORGANICCHEMISTRY

By C. K. Ingold, University of London

"There can be no question that this is one of thefew great books on organic chemistry. It is . . .a fascinating account of modern organic chem-ical theory. . . ."-Journal of the AmericanChemical Society

1953. 835 pages, 45 figures, 162 tables. $9.75

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An Introduction to ElectronicAbsorption Spectroscopy inOrganic ChemistryBy A. Gillam, D.Sc. and E. S. Stern, Ph.D. * Thisnew introduction to a rapidly developingfield concentrates on electronic absorptionin the visible and ultra-violet regions-mostvaluable for problems in organic and bio-chemistry. Figures, charts and tables. $8.00

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