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Biographical 7 lemoirs NATIONAL ACADEMY OF SCIENCES

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NATIONAL ACADEMY OF SCIENCES OF INK UNITED STATES OF AMERICA Fry #coke VOLUME XLV NATIONAL ACADEMY OF SCIENCES WASHINGTON, D. C. 1 9 ~ 4

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INTERNATIONAL STANDARD BOOK NUMBER 0-309-02239-8 LIBRARY OF CONGRESS CATALOG CARD NUMBER 74-7655 Available from PRINTING AND PUBLISHING OFFICE, NATIONAL ACADEMY OF SCIENCES 2101 CONSTITUTION AVENUE, N.W., WASHINGTON, D.C. 20418 PRINTED IN THE UNITED STATES OF AMERICA

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CONTENTS PREFACE HAROLD DELOS BABCOCK BY IRA S. BOWEN IRVING WIDMER BAILEY BY RALPH H. WETMORE EDWARD WILBER BERRY BY ERNST CLOOS MARSTON TAYLOR BOGERT BY LOUIS P. HAMMETT PAUL SOPHUS EPSTEIN BY JESSE W. M. DUMOND HERBERT McLEAN EVANS BY GEORGE W. CORNER VICTOR KUHN LaMER BY LOUIS P. HAMMETT V V11 1 21 57 97 27 53 93

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V1 C O N T E N T S IRVING LANGMUIR BY C. GUY SUITS AND MILES J. MARTIN JOSEPH HOOVER MACKIN BY HAROLD L. JAMES ELMER VERNER McCOLLUM BY HARRY G. DAY GEORGE RICHARDS MINOT BY W. B. CASTLE CARL RICHARD MOORE BY DOROTHY PRICE JAMES FLACK NORRIS BY JOHN D. ROBERTS OSCAR RIDDLE BY GEORGE W. CORNER 215 249 263 337 385 413 427

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P REFACE The Biographical Memoirs is a series of volumes containing the biographies of deceased members of the National Academy of Sciences and bibliographies of their published scientific works. Each biographical essay has been written by a fellow member of the Academy familiar with the professional career of the deceased, with only occasional exceptions. These vol- umes, therefore, provide a record of the lives and work of some of the most distinguished leaders of American science as wit- nessed and interpreted by their colleagues and peers. The National Academy of Sciences is a private, honorary organization of scientists and engineers elected on the basis of outstanding contributions to knowledge. Established by a Con- gressional Act of Incorporation on March 3, 1863, and sup- ported by private and public funds, the Academy works to further science and its use for the general welfare by bringing together the most qualified individuals to deal with scientific and technological problems of broad significance. . . V11

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Biographical ~Vlemoirs VOLUME XLV

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