Articles

 New Drugs: The Tortuous Road to Approval

Maurice B. Visscher
Science 21 April 1967: 313.
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 Definitions, Distinctions, and Dichotomies

A. W. K. Metzner
Science 21 April 1967: 313-314.
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 Letter to the Editor

David Bruson
Science 21 April 1967: 314.
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 Statistical Randomization in the Behavioral Sciences

Herbert J. Walberg
Science 21 April 1967: 314.
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 Growth Incentives in the "Have-Not" Nations

Harald Frederiksen
Science 21 April 1967: 314-316.
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 Letter to the Editor

V. L. Parsegian
Science 21 April 1967: 316.
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 Copyright and Computers

Dael Wolfle
Science 21 April 1967: 319.
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 Electron Beams: National Bureau of Standards and the New Technology

H. W. Koch
Science 21 April 1967: 321-328.
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Regulation of Food Intake and Obesity

Jean Mayer and Donald W. Thomas
Science 21 April 1967: 328-337.
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Molecular Aspects of Lens Cell Differentiation

John Papaconstantinou
Science 21 April 1967: 338-346.
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 Mass Drug Catastrophes and the Roles of Science and Technology

Walter Modell
Science 21 April 1967: 346-351.
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 Implant Biotelemetry and Microelectronics

W. H. Ko and M. R. Neuman
Science 21 April 1967: 351-360.
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 The National Academy of Sciences: Profile of an Institution (II)

D. S. Greenberg
Science 21 April 1967: 360-364.
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 NEWS IN BRIEF

Science 21 April 1967: 363.
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 Military Research: A Decline in the Interest of Scientists?

Bryce Nelson
Science 21 April 1967: 364-366.
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 Anthropologists Overwhelmingly Approve Research Ethics Statement

B. N.
Science 21 April 1967: 365.
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 Funding Project Themis: A Clarification

E. L.
Science 21 April 1967: 366.
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 Molecular Biology: British Groups Push Enzyme-Structure Studies

Nigel Calder
Science 21 April 1967: 367-369.
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 Appointments

Science 21 April 1967: 369.
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Thyroxine: Effects of Neonatal Administration on Maturation, Development, and Behavior

Shawn Schapiro and Robert J. Norman
Science 21 April 1967: 369.
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Mechanism of Antibody Synthesis: Size Differences between Mouse Kappa Chains

William R. Gray, Willian J. Dreyer, and Leroy Hood
Science 21 April 1967: 369.
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 Recent Deaths

Science 21 April 1967: 369.
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 Book Reviews

Science 21 April 1967: 370-373.
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 Books Received

Science 21 April 1967: 373.
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Distribution and Variability of Cosmic X-Ray Sources

H. Friedman, E. T. Byram, and T. A. Chubb
Science 21 April 1967: 374-378.
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Vertebrate Evidence of a Low Sea Level in the Middle Pliocene

S. David Webb and Norman Tessman
Science 21 April 1967: 379.
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Bering Land Bridge: Evidence of Spruce in Late-Wisconsin Times

Paul A. Colinvaux
Science 21 April 1967: 380-383.
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Foraminiferal Ooze: Solution at Depths

Wolfgang H. Berger
Science 21 April 1967: 383-385.
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Chemical Exfoliation of Vermiculite and the Production of Colloidal Dispersions

G. F. Walker and W. G. Garrett
Science 21 April 1967: 385-387.
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Amino Acid Coding in Sarcina lutea and Saccharomyces cerevisiae

William E. Groves and Ellis S. Kempner
Science 21 April 1967: 387-390.
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Hydrocarbons in Digestive Tract and Liver of a Basking Shark

Max Blumer
Science 21 April 1967: 390-391.
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Gastrin Antibodies: Induction, Demonstration, and Specificity

D. R. Schneider, G. L. Endahl, M. C. Dodd, J. E. Jesseph, N. J. Bigley, and R. M. Zollinger
Science 21 April 1967: 391-392.
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Viral Hemorrhagic Encephalopathy of Rats

Adnan H. ElDadah, Neal Nathanson, Kendall O. Smith, Robert A. Squire, George W. Santos, and Edward C. Melby
Science 21 April 1967: 392-394.
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Suppressor Selection for Amino Acid Replacements Expected on the Basis of the Genetic Code

Hillard Berger and Charles Yanofsky
Science 21 April 1967: 394-397.
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Hemoglobin ₂₂^{121 Lys} Chemical Identification in an Egyptian Family

K. A. Kamel, K. C. Hoerman, and A. Y. Awny
Science 21 April 1967: 397-398.
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Seed Dormancy: Breaking by Uncouplers and Inhibitors of Oxidative Phosphorylation

L. A. T. Ballard and A. E. Grant Lipp
Science 21 April 1967: 398-399.
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Malic Dehydrogenase Isozymes: Distribution in Developing Nucleate and Anucleate Halves of Sea Urchin Eggs

Grant W. Patton, Jr., Laurens Mets, and Claude A. Villee
Science 21 April 1967: 400-401.
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Serotonin: Release in the Forebrain by Stimulation of Midbrain Raphé

George K. Aghajanian, John A. Rosecrans, and Michael H. Sheard
Science 21 April 1967: 402-403.
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Rapid Eye Movement Sleep Deprivation: A Central-Neural Change during Wakefulness

James H. Dewson, III, William C. Dement, Terry E. Wagener, and Kenneth Nobel
Science 21 April 1967: 403-406.
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Perceived Number and Evoked Cortical Potentials

M. Russell Harter and C. T. White
Science 21 April 1967: 406-408.
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Permanence of Retrograde Amnesia Produced by Electroconvulsive Shock

Marvin W. Luttges and James L. McGaugh
Science 21 April 1967: 408-410.
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 The Plio-Pleistocene Boundary

Gerald M. Richmond and Cesare Emiliani
Science 21 April 1967: 410.
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 Sailing Yacht Research

Britton Chance, SR., Pierre deSaix, Halsey Herrreshoff, and Jerome H. Milgram
Science 21 April 1967: 411-412.
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