Articles

 Caucasian Genes in American Negroes

E. N. Anderson, Jr.
Science 12 December 1969: 1353.
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 Letters to the Editor

T. Edward Reed
Science 12 December 1969: 1353.
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 Social Work—Dr. Wiesner!

Dennis M. Dailey
Science 12 December 1969: 1353.
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 Population: Covered Dish Dynamics

N. Philip Ashmole
Science 12 December 1969: 1354.
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 Upjohn's Position on Panalba

R. T. Parfet, Jr.
Science 12 December 1969: 1354.
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 Open Letter

Science 12 December 1969: 1357.
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 The Motion of Ions: Principles and Concepts

Lars Onsager
Science 12 December 1969: 1359-1364.
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 Antigenicity: Some Molecular Aspects

Michael Sela
Science 12 December 1969: 1365-1374.
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 The Structure of Discovery

Peter Caws
Science 12 December 1969: 1375-1380.
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 France: Attempt To Slash Numbers Stirs Medical School Strike

D. S. Greenberg
Science 12 December 1969: 1381-1383.
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 Soviets, West Discuss "Think Tank"

D. S. Greenberg
Science 12 December 1969: 1382.
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 Pesticide Research: Industry, USDA Pursue Different Paths

Joel R. Kramer
Science 12 December 1969: 1383-1386.
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 Food Delegates Focus on Poor

Nancy Gruchow
Science 12 December 1969: 1385.
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 Pentagon Promises To Observe Congressional Curbs on Research

Science 12 December 1969: 1386-1388.
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 NEWS IN BRIEF

Science 12 December 1969: 1387.
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 RECENT DEATHS

Science 12 December 1969: 1388.
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 The Logic of Explanation in Psychoanalysis. Michael Sherwood. Academic Press, New York, 1969. x + 278 pp. $9.50

Jane Loevinger
Science 12 December 1969: 1389-1390.
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 Think. A Biography of the Watsons and IBM. William Rodgers. Stein and Day, New York, 1969. 320 pp. + plates. $7.95

George J. Stigler
Science 12 December 1969: 1390-1391.
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 Third Symposium on the Structure of Low-Medium Mass Nuclei. Lawrence, Kans., 1968. J. P. Davidson, Ed. University Press of Kansas, Lawrence, 1968. viii + 296 pp., illus. $12.50

M. Harvey
Science 12 December 1969: 1391.
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 Ion Exchange and Solvent Extraction of Metal Complexes. Y. Marcus and A. S. Kertes. Interscience (Wiley), New York, 1969. xii + 1044 pp., illus. $44.95

Robert Kunin
Science 12 December 1969: 1391-1392.
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 Food-Borne Infections and Intoxications. Hans Riemann, Ed. Academic Press, New York, 1969. xxviii + 700 pp., illus. $28. Food Science and Technology, vol. 5

Claude E. Dolman
Science 12 December 1969: 1392.
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 An Introduction to Nonlinear Optics. George C. Baldwin. Plenum, New York, 1969. x + 158 pp., illus. $9.50

I. P. Kaminow
Science 12 December 1969: 1392.
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Mariners 6 and 7: Radio Occultation Measurements of the Atmosphere of Mars

Arvydas Kliore, Gunnar Fjeldbo, Boris L. Seidel, and S. I. Rasool
Science 12 December 1969: 1393-1397.
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Man-Made Carbon-14 in Deep Pacific Waters: Transport by Biological Skeletal Material

B. L. K. Somayajulu, D. Lal, and S. Kusumgar
Science 12 December 1969: 1397-1399.
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Tuhualite Crystal Structure

Stefano Merlino
Science 12 December 1969: 1399-1401.
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Interstellar Scintillations of Pulsar Radiation

Kenneth R. Lang
Science 12 December 1969: 1401-1403.
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Divalent Phosphate Electrode

Irving Nagelberg, Leroy I. Braddock, and Giulio J. Barbero
Science 12 December 1969: 1403-1404.
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Structure of an Oxygen-Carrying Cobalt Complex

Bi-Cheng Wang and William P. Schaefer
Science 12 December 1969: 1404-1406.
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Benzene Complexes with Copper(II)montmorillonite

H. E. Doner and M. M. Mortland
Science 12 December 1969: 1406-1407.
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Blind River Dolphin: First Side-Swimming Cetacean

Earl S. Herald, Robert L. Brownell, Jr., Fredric L. Frye, Elkan J. Morris, William E. Evans, and Alan B. Scott
Science 12 December 1969: 1408-1410.
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Intracranial Drug Implants: An Autoradiographic Analysis of Diffusion

Sebastian P. Grossman and Walter E. Stumpf
Science 12 December 1969: 1410-1412.
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Hypobaric Hypoxia: Effects on Early Development of Tryptophan Oxygenase in Neonatal Rats

Ralph P. Francesconi and Milton Mager
Science 12 December 1969: 1412-1413.
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Specific Tissue Graft Rejection in Earthworms

Edwin L. Cooper
Science 12 December 1969: 1414-1415.
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Pathotoxin-Induced Disease Resistance in Plants

Harry Wheeler and Thomas P. Pirone
Science 12 December 1969: 1415-1417.
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m-Hydroxyphenylacetic Acid Formation from L-Dopa in Man: Suppression by Neomycin

M. Sandler, F. Karoum, C. R. J. Ruthven, and D. B. Calne
Science 12 December 1969: 1417-1418.
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Prostaglandins E₁ and E₂ Antagonize Norepinephrine Effects on Cerebellar Purkinje Cells: Microelectrophoretic Study

Barry J. Hoffer, George R. Siggins, and Floyd E. Bloom
Science 12 December 1969: 1418-1420.
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Hageman Factor (Factor XII) Deficiency in Marine Mammals

A. Jean Robinson, Mona Kropatkin, and Paul M. Aggeler
Science 12 December 1969: 1420-1422.
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Androgenesis Conditioned by a Mutation in Maize

J. L. Kermicle
Science 12 December 1969: 1422-1424.
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Tobacco Smoke Toxicity: Loss of Human Oral Leukocyte Function and Fluid-Cell Metabolism

Bertram Eichel and H. Arto Shahrik
Science 12 December 1969: 1424-1428.
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Hemoglobins A and A₂ in New World Primates: Comparative Variation and Its Evolutionary Implications

Samuel H. Boyer, Emilio F. Crosby, Theodore F. Thurmon, Andrea N. Noyes, Gail F. Fuller, Sanford E. Leslie, Marguerite K. Shepard, and C. Nash Herndon
Science 12 December 1969: 1428-1431.
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Lateral Hypothalamic Stimulation: Inhibition of Aversive Effects by Feeding, Drinking, and Gnawing

Joseph Mendelson
Science 12 December 1969: 1431-1433.
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Compulsive Sexual Activity Induced by p-Chlorophenylalanine in Normal and Pinealectomized Male Rats

Alessandro Tagliamonte, Paola Tagliamonte, Gian L. Gessa, and Bernard B. Brodie
Science 12 December 1969: 1433-1435.
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Avoidance Learning: Long-Lasting Deficits after Temporal Lobe Seizure

James D. Belluzzi and Sebastian P. Grossman
Science 12 December 1969: 1435-1437.
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 Why Is the Moon Gray?

W. F. Libby
Science 12 December 1969: 1437-1438.
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 Irreversible Thermodynamics and Flow across Membranes

Gerald S. Manning, E. H. Bresler, and R. P. Wendt
Science 12 December 1969: 1438.
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 AAAS Symposia

Science 12 December 1969: 1439.
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 The Sorry State of Science

Science 12 December 1969: 1440-1444.
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 Science and Survival: The Pugwash Conference at Sochi, U.S.S.R

Alexander Rich
Science 12 December 1969: 1445-1446.
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 Forthcoming Events

Science 12 December 1969: 1446-1448.
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