CENCO HOTCONE HEATERS

The Cenco Hotcone Heater is β fast, convenient, and eco­nomical heat source for the laboratory. The concentric ring top accommodates various wares. No. 16500Afor

115 volts $16.00 No. 16500B for

230 volts 20.60

C E N T R A L . S C I E N T I F I C C O M P A N Y

1 7 0 0 I R V I N G PARK R O A D . C H I C A G O 13

Describes in Detail the Difference between

D I S T I L L E D WATER and

DEMINERALIZED WATER Write Today for Your Copy of

Catalog 123

IRarristead i H I S L # S H U Λ KIHtl l l / t l t I'll.

19 Lanesville Terrace · Boston 3 1 , Matt.

BOOKS

GOVERNMENT PUBLICATIONS The following documents are available at prices indicated from the Superin­tendent of Documents, Government Printing Office, Washington 25, D . C. In ordering publications, give the complete title and issuing office and enclose price in postal money order, coupons, or check. D o nut send postage stamps. When no price is indicated, pamphlet is free and obtainable from issuing organizations.

Department of Agriculture Agricultural and Industrial Chemistry Annotated Bibliography of Subtillin,

Assay, Microbiological Production, Puri­fication and Chemistry, Biological Ac­tivity, and Related Compounds. J. C. LEWIS. Western Regional Research Labo­ratory. AlC 168. 13 pages.

Benzvl Allyl Starch and Other Mixed Allyl Starch Ethers. E. A. TALLEY et al. Eastern Regional Research Laboratory. AlC 261. 7 pages.

List of Publications and Patents of Northern Regional Research Laboratory? July-Dec. 1949. AlC 187, suppl. 4. 8 pages.

List of Publications and Patents with Abstracts, Western Regional Research Laboratory, July 1-Dec. 31, 1949. AIC 218, suppl. 4. 6 pages.

N e w Frozen Purees from Citrus Fruits. E. A. BEAVENS. AIC 238. 6 pages.

Publications with Abstracts of Enzyme Research Division, Western Regional Re­search Laboratory, Albany, Calif., Nov. 1937-Dec. 1947. AIC 219. 9 pages.

Publications with Abstracts, Fruit and Vegetable Products Laboratory (coopera­tive with Washington Agricultural Experi­ment Station), Mar. 1942-Apr. 1949. AIC 221. 4 pages.

Publications with Abstracts of Phar­macology Laboratory, Western Regional Research Laboratory, Albany, Calif., Nov. 1940-Jan. 1, 1948. AIC 220. 6 pages.

Publications with Abstracts of Phar­macology Laboratory, Western Regional Research Laboratory, Albany, Calif., July 1948. AIC 220, suppl. I. 2 pages.

Selected Bibliography of Periodical Literature on Fruit and Vegetable Proc­essing Wastes. O. R. VASAK AND W . L. SHAW. AIC 232. 12 pages.

Southern Regional Research Labora­tory, Publications and Patents, July—Dec. 1949. AIC 188, suppl 4. 14 pages.

Tentative Recommendations for Treat­ment of Berry Boxes (Hallocks) to Re­duce Mold Growth. E. J. BARTA AND E. LOWE. AIC 239. 2 pages.

Utilization of White Potatoes, Esti­mates in Accordance with 1949 Goal (with list of references). R. H. T R E A D -WAY. AIC 242. 2 pages.

Atomic Energy Commission Handbook on Aerosols. 147 pages. 60

cents.

Department of Commerce Foreign and Domestic Commerce

Bureau Aliphatic Solvent Chemicals. H. A.

S M A L L . Business Information Service. 7 pages.

Organic Chemicals Production. H . A. SMALL. Business Information Service. 3 pages.

World Trade in Commodities; v. 8 , pt. 2, Chemicals: Digest of International Chemical Developments. 4 pages. 5 cents.

Same: Market for Paints and Related Materials, Tunisia, Tangier and Interna­tional Zones of Morocco, and Algeria. 4 pages. 5 cents.

Same: Organic Chemicals and Related Products, Japan. 2 pages. 5 cents.

Same: Digest of International Chemi­cal Developments. 4 pages. 5 cents.

Same: Plastics Industry and Trade in Finland. 2 pages. 5 cents.

Same: Markets for New Organic Pest Control Products, Belgium, Denmark, The Netherlands and Switzerland. 4 pages. 5 cents.

Same: Paints and Related Materials and Printing and Lithographic Inks, Bel­gium. 4 pages. 5 cents.

Same: pt. 16, Rubber and Products: Rubber and Products, United States of Indonesia. 2 pages. 5 cents.

Same: Rubber Products, Dominican Republic and Haiti. 4 pages. 5 cents.

Congress Atomic Energy Joint Committee

Civil Defense Against Atomic Attack, Hearing in Executive Session, 81st Con­gress, 2nd Session, Mar. 30, 1950. Pt. 2, 42 pages.

Confirmation of Thomas E . Murray to Be Member of Atomic Energy Commis­sion, Hearing, 81st Congress, 2nd Session, Mar. 29 , 1950. 5 pages.

House of Representatives Hearings Regarding Shipment of

Atomic Material to Soviet Union During World War II, 81st Congress, 1st and 2nd Sessions, Dee . 5, 1949-Mar. 7, 1950. Un-American Activities Committee. 294 pages.

Federal Security Agency Food and Drug Administration

Notices of Judgment Under Federal Food, Drug, and Cosmetic Act: Drugs and Devices, N. J. 2851-70. 23 pages.

Same: N. J. 2871-90. 12 pages. Same: N. J. 2891-2910. 10 pages. Same: Foods, N. J. 15001-50. 18 pages. Same: N. J. 15051-100. 2 2 pages. Same: N. J. 15101-150. 24 pages.

Department of Interior Bureau of Mines

American Lignites: Geological Occur­rence, Pétrographie Composition, and Ex-tractable Waxes. W. A. SELVIG et al. Bull. 482. 63 pages. 35 cents.

Analyses of Crude Oils from Some Fields of Southeastern United States. O. C. BLADE AND E. L. GARTON. Rept. Invest. 4687.

East of Mississippi River, Gold, Silver, Copper, Lead, and Zinc. S. A. GUSTAV-SON. Reprint from Minerals Yearbook, 1948. 14 pages. 5 cents.

Iron and Steel. Ν . Β. MELCHER. Pre­print from Minerals Yearbook, 1948. 20 pages. 10 cents.

Preliminary Survey of Zirconium Al­loys. C. T. ANDERSON et al. Rept. In­vest. 4658. 48 pages.

Recent Rock-Dusting Experiments for Arresting Coal-Mine Explosions. IRVING H A R T M A N N et al. Rept Invest. 4688.

Safety in the Mining Industry. D . HARRINGTON, J. H. E A S T , JR. , AND R. G. WARNCKE. Bulletin 481. 40 cents.

2126 C H E M I C A L A N D E N G I N E E R I N G N E W S

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