Articles

 Instructions for Contributors

Science 27 December 1968: 0.
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 More on Amazonian Fauna

Charles W. Quaintance
Science 27 December 1968: 1432.
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 Letters to the Editor

Mike Tsalickis
Science 27 December 1968: 1432.
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 Letters to the Editor

Alan Mark Fletcher
Science 27 December 1968: 1432-1433.
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 Homology as Applied to Proteins

William P. Winter, Kenneth A. Walsh, and Hans Neurath
Science 27 December 1968: 1433.
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 Regulation of Indirect Costs

Robert N. Faiman
Science 27 December 1968: 1433.
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 Lee DuBridge

Philip H. Abelson
Science 27 December 1968: 1435.
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 Temperatures of the Earth's Upper Atmosphere

J. C. G. Walker and N. W. Spencer
Science 27 December 1968: 1437-1442.
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 Psychochemical Research Studies in Man

Arnold J. Mandell and Charles E. Spooner
Science 27 December 1968: 1442-1453.
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 Genotype, Environment, and Population Numbers

Francisco J. Ayala
Science 27 December 1968: 1453-1459.
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 Nerve Gas: Dugway Accident Linked to Utah Sheep Kill

Philip M. Boffey
Science 27 December 1968: 1460-1464.
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 Peace Research: SIPRI, in Sweden, Is Making a Role for Itself

D. S. Greenberg
Science 27 December 1968: 1465-1466.
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 APPOINTMENTS

Science 27 December 1968: 1466.
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 Prelude to Riot. A View of Urban America from the Bottom. Paul Jacobs. Sponsored by the Center for the Study of Democratic Institutions. Random House, New York, 1967. xii + 298 pp. $5.95

Elliot Liebow
Science 27 December 1968: 1467-1468.
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 Factors Influencing Myocardial Contractility. A Gordon Research Conference, 1966. Ralph D. Tanz, Frederic Kavaler, and Jay Roberts, Eds. Academic Press, New York, 1967. xxvi + 693 pp., illus. $28

Melvyn Lieberman
Science 27 December 1968: 1468-1469.
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 Coronary Circulation and Energetics of the Myocardium. Proceedings of an international symposium, Milan, Italy, 1966. G. Marchetti and B. Taccardi, Eds. Karger, Basel, 1967 (distributed in the U.S. by Phiebig, White Plains, N. Y.). xvi + 320 pp., illus. $18

John P. Boineau
Science 27 December 1968: 1469.
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 Metamorphic Petrology. Mineralogical and Field Aspects. Francis J. Turner. McGraw-Hill, New York, 1968. xii + 403 pp., illus. $13.50. International Series in the Earth and Planetary Sciences

James B. Thompson, Jr.
Science 27 December 1968: 1469-1470.
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 The Human Face. An Account of the Postnatal Growth and Development of the Craniofacial Skeleton. Donald H. Enlow. Illustrations by William L. Brudon. Harper and Row, New York, 1968. xvi + 304 pp., illus. $20

Melvin L. Moss
Science 27 December 1968: 1470.
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 High-Temperature Materials and Technology. Ivor E. Campbell and Edwin M. Sherwood, Eds. Wiley, New York, 1967. xii + 1022 pp., illus. $27.50. Electrochemical Society Series

Fred Ordway
Science 27 December 1968: 1470-1471.
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 American Locomotives. An Engineering History, 1830-1880. John H. White, Jr. Johns Hopkins Press, Baltimore, 1968. xxiv + 504 pp., illus. $20

Carl W. Condit
Science 27 December 1968: 1471-1472.
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Investigation of Horizon Beta

Charles C. Windisch, R. J. Leyden, J. L. Worzel, T. Saito, and J. Ewing
Science 27 December 1968: 1473-1479.
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Spores, Pollen, and Microplankton from the Horizon Beta Outcrop

Daniel Habib
Science 27 December 1968: 1480-1481.
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Pulsating Radio Sources near the Crab Nebula

David H. Staelin and Edward C. Reifenstein, III
Science 27 December 1968: 1481-1483.
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Surface Structure of Polymers: Glancing-Angle Electron Diffraction Study of Polyethylene

Harold Schonhorn and J. Drobek
Science 27 December 1968: 1483-1484.
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Inhibition of Cell Growth in vitro by Adenosine 3', 5'-Monophosphate

Wayne L. Ryan and Margaret L. Heidrick
Science 27 December 1968: 1484-1485.
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Virus-Like Particles in the Spiral Ganglion of the Guinea Pig Cochlea

Joseph L. Craft and David A. Hilding
Science 27 December 1968: 1485-1487.
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Photoregulation of an Enzymic Process by Means of a Light-Sensitive Ligand

H. Kaufman, S. M. Vratsanos, and B. F. Erlanger
Science 27 December 1968: 1487-1489.
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Reactions of Aromatic and Sulfur Amino Acids in Ribonuclease with Hydrogen Atoms in Water Solution

Raymond Shapira and Gabriel Stein
Science 27 December 1968: 1489-1491.
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Staphylococcal Nuclease: Size and Specificity of the Active Site

Pedro Cuatrecasas, Meir Wilchek, and Christian B. Anfinsen
Science 27 December 1968: 1491-1493.
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Warfarin Treatment of Mice Bearing Autochthonous Tumors: Effect on Spontaneous Metastases

James J. Ryan, Alfred S. Ketcham, and Hilda Wexler
Science 27 December 1968: 1493-1494.
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lmmunologic Enhancement of Tumor Xenografts by Pepsin-Degraded Immunoglobulin

Samuel Broder and Frank Whitehouse, Jr.
Science 27 December 1968: 1494-1495.
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Sterol Precursors of Cholesterol in Adult Human Brain

Giovanni Galli, Enrica Grossi Paoletti, and Joseph F. Weiss
Science 27 December 1968: 1495-1496.
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Biologic Precipitation of Fluorite

H. A. Lowenstam and Duncan McConnell
Science 27 December 1968: 1496-1498.
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Amino Acid Composition of Organic Matrix in Calcareous Oolites

Richard M. Mitterer
Science 27 December 1968: 1498-1499.
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Receptors Sensitive to Carbon Dioxide in Lungs of Chicken

D. F. Peterson and M. R. Fedde
Science 27 December 1968: 1499-1501.
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Separation of Cellular from Extracellular Controls of Drinking in Rats by Frontal Brain Damage

Elliott M. Blass
Science 27 December 1968: 1501-1503.
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Sleep after Exercise

J. Allan Hobson
Science 27 December 1968: 1503-1505.
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Is Orentation-Specific Color Adaptation in Human Vision Due to Edge Detectors, Afterimages, or "Dipoles"?

Charles S. Harris and Alan R. Gibson
Science 27 December 1968: 1506-1507.
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 Potassium Feldspar in Weekeroo Station, Kodaikanal, and Colomera Iron Meteorites

T. E. Bunch and Edward Olsen
Science 27 December 1968: 1507-1508.
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 Chromosomal Effect and LSD: Samples of Four

William H. Kruskal, Shelby Haberman, F. W. Whitmore, Robert S. Sparkes, David Thomas, John Melnyk, and Louis Bozzetti
Science 27 December 1968: 1508-1509.
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 Factors Determining Spatial and Size-Frequency Distributions of Gemma gemma

Roger H. Green, Katharine D. Hobson, and Jeremy B. C. Jackson
Science 27 December 1968: 1509-1510.
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 Peptides

Boris Weinstein and Saul Lande
Science 27 December 1968: 1511-1514.
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 Calendar of Events

Science 27 December 1968: 1514.
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