Articles

 Letters to the Editor

Nathaniel H. Barish
Science 19 September 1969: 1206.
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 The Fit alid the Unfit

Susan Schiff
Science 19 September 1969: 1206.
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 ACE Study of Campus Unrest

Kenneth Keniston
Science 19 September 1969: 1206-1207.
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 Foundation or Public Charity

Dael Wolfle
Science 19 September 1969: 1209.
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 Preliminary Examination of Lunar Samples from Apollo 11

Science 19 September 1969: 1211-1227.
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 Differentiation of Populations

Paul R. Ehrlich and Peter H. Raven
Science 19 September 1969: 1228-1232.
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 Social Benefit versus Technological Risk

Chauncey Starr
Science 19 September 1969: 1232-1238.
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 British AAS: Counterattack on Gloom about Science and Man

D. S. Greenberg
Science 19 September 1969: 1239-1240.
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 British to Probe Effects of Riot Gas

D. S. G.
Science 19 September 1969: 1240.
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 Yugoslavia: Seeking To Link Science with Development

Andrew Jamison
Science 19 September 1969: 1241-1243.
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 NIH Partly Restores Cuts in Grants

Science 19 September 1969: 1242.
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 Antipoverty R & D: Chicago Debacle Suggests Pitfalls Facing OEO

John Walsh
Science 19 September 1969: 1243-1245.
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 Lewis and Clark. Pioneering Naturalists. Paul Russell Cutright. University of Illinois Press, Urbana, 1969. xvi + 510 pp. + plates. $12.50

John C. Greene
Science 19 September 1969: 1246-1247.
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 Eskimo Prehistory. Hans-Georg Bandi. Translated from the German edition by Ann E. Keep. University of Alaska Press, College, 1969 (distributed by University of Washington Press, Seattle). xii + 228 pp., illus. $6.50. Studies of Northern Peoples, No. 2

Chester S. Chard
Science 19 September 1969: 1247.
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 Geological History of Southern Africa. S. H. Haughton. Published for the South African Chamber of Mines by the Geological Society of South Africa, Johannesburg, 1969. viii + 536 pp. + plates. R10.50

Brian J. Skinner
Science 19 September 1969: 1247-1248.
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 Prehistory of North America. Jesse D. Jennings. McGraw-Hill, New York, 1969. xiv + 402 pp., illus. $9.95

Roger T. Grange, Jr.
Science 19 September 1969: 1248.
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 Bacterial Physiology and Metabolism. J. R. Sokatch. Academic Press, New York, 1969. xii + 444 pp., illus. $14.50

J. Lascelles
Science 19 September 1969: 1248-1249.
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 Insect Vision. Georgii A. Mazokhin-Porshnyakov. Translated from the Russian edition by Roberto and Liliana Masironi. Timothy H. Goldsmith, Transl. Ed. Plenum, New York, 1969. xiv + 306 pp., illus. $22.50

Myron L. Wolbarsht
Science 19 September 1969: 1249.
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 Books Received

Science 19 September 1969: 1249-1297.
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Crystal Structure of Benzene II at 25 Kilobars

G. J. Piermarini, A. D. Mighell, C. E. Weir, and S. Block
Science 19 September 1969: 1250-1255.
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Underground Nuclear Explosions and the Control of Earthquakes

Cesare Emiliani, Christopher G. A. Harrison, and Mary Swanson
Science 19 September 1969: 1255-1256.
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Atmospheric Temperature: Successful Test of Remote Probing

D. Q. Wark and D. T. Hilleary
Science 19 September 1969: 1256-1258.
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Interferometer Experiment on Nimbus 3: Preliminary Results

R. Hanel and B. Conrath
Science 19 September 1969: 1258-1260.
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Heterogeneity of Presumably Homogeneous Protein Preparations

Walter A. Susor, Marion Kochman, and William J. Rutter
Science 19 September 1969: 1260-1262.
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Diphosphonates Inhibit Hydroxyapatite Dissolution in vitro and Bone Resorption in Tissue Culture and in vivo

Herbert Fleisch, R. Graham, G. Russell, and Marion D. Francis
Science 19 September 1969: 1262-1264.
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Diphosphonates Inhibit Formation of Calcium Phosphate Crystals in vitro and Pathological Calcification in vivo

Marion D. Francis, R. Graham, G. Russell, and Herbert Fleisch
Science 19 September 1969: 1264-1266.
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Ant Alarm Pheromone Activity: Correlation with Molecular Shape by Scanning Computer

John E. Amoore, Guido Palmieri, Enzo Wanke, and Murray S. Blum
Science 19 September 1969: 1266-1269.
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Unit Activity: Motivation-Dependent Responses from Midbrain Neurons

M. Ian Phillips and James Olds
Science 19 September 1969: 1269-1271.
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Retention of Delayed-Alternation: Effect of Selective Lesions of Sulcus Principalis

Nelson Butters and Deepak Pandya
Science 19 September 1969: 1271-1273.
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Reticular Stimulation and Chlorpromazine: An Animal Model for Schizophrenic Overarousal

Conan Kornetsky and Mona Eliasson
Science 19 September 1969: 1273-1274.
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 Early Temperature History of the Moon

Harold C. Urey
Science 19 September 1969: 1275.
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 TEKTITE—

Stanley Deutsch
Science 19 September 1969: 1276-1277.
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 Serially Cultured Animal Cells for Preparation of Viral Vaccines

Stanley A. Plotkin, Harry Eagle, Leonard Hayflick, Drago Ikic, Hilary Koprowski, and Frank Perkins
Science 19 September 1969: 1278-1282.
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 Forthcoming Events

Science 19 September 1969: 1283-1288.
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