Articles

 Sensors Aloft

G. DuS.
Science 24 October 1958: 967.
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 Teaching Machines: From the experimental study of learning come devices which arrange optimal conditions for self-instruction.

B. F. Skinner
Science 24 October 1958: 969-977.
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 The Microfluoroscope: An x-ray microscope for direct visual or photometric measurements in biological specimens is described.

Howard H. Pattee, Jr.
Science 24 October 1958: 977-981.
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 Echo Ranging in the Porpoise: Perception of objects by reflected sound is demonstrated for the first time in marine animals.

W. N. Kellogg
Science 24 October 1958: 982-988.
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 Dosimetry of Radioisotopes: A nomogram permits the estimation of the radiation dose delivered by 30 isotopes of biological interest.

A. J. Bertinchamps and G. C. Cotzias
Science 24 October 1958: 988-990.
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 Taxonomic Codification of Biological Entities: A system is proposed for taxonomic codification of biological entities adaptable to machine handling.

H. A. Denmark, H. V. Weems, Jr., and Carlis Taylor
Science 24 October 1958: 990-992.
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 News of Science: Antarctic Research Program at U.S. Stations Resumes after Polar Winter

Science 24 October 1958: 992-996.
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 Book Reviews

Science 24 October 1958: 997-1000.
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 Some Principles of Self-Contained Underwater Breathing Apparatus

R. STUART MACKAY
Science 24 October 1958: 1001-1002.
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Preservation of Whole Blood in Frozen State for Transfusion

MAX M. STRUMIA, LOUISE C. COLWELL, and PAUL V. STRUMIA
Science 24 October 1958: 1002-1003.
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Ionium-Thorium Chronology in Deep-Sea Sediments of the Pacific

EDWARD D. GOLDBERG and MINORU KOIDE
Science 24 October 1958: 1003.
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Radio Control of Ventricular Contraction in Experimental Heart Block

M. VERZEANO, R. C. WEBB, JR., and M. KELLY
Science 24 October 1958: 1003-1005.
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Method of Polarographic in vivo Continuous Recording of Blood Oxygen Tension

F. KREUZER and C. G. NESSLER, JR.
Science 24 October 1958: 1005-1006.
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 Quantitative Technique for Analysis of Radiation-Induced Tumorization in Fern Prothalli

CARL R. PARTANEN
Science 24 October 1958: 1006-1007.
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 An Olfactometer for the Rat

CARL PFAFFMANN, WILLIAM R. GOFF, and JOHN K. BARE
Science 24 October 1958: 1007-1008.
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 Chromatography of Molten Salts on a Glass Powder Column

MICHAEL M. BENARIE
Science 24 October 1958: 1008.
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 Nonpolar Transport of Gibberellin through Pea Stem and a Method for Its Determination

JIRO KATO
Science 24 October 1958: 1008-1009.
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 Meetings

Science 24 October 1958: 1010.
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 Equipment

JOSHUA STERN
Science 24 October 1958: 1011-1013.
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