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Popular Science Library
EDITOR-IN-CHIEF
GARRETT P. SERVISS
AUTHORS
WILLIAM J. MILLER · HIPPOLYTE GRUENER · A. RUSSELL BOND
D. W. HERING LOOMIS HAVEMEYER · ERNEST G. MARTIN
ARTHUR SELWYN-BROWN · ROBERT CHENAULT GIVLER
ERNEST INGERSOLL · WILFRED MASON BARTON
WILLIAM B. SCOTT · ERNEST J. STREUBEL
NORMAN TAYLOR · DAVID TODD
CHARLES FITZHUGH TALMAN
ROBIN BEACH
ARRANGED IN SIXTEEN VOLUMES
WITH A HISTORY OF SCIENCE, GLOSSARIES
AND A GENERAL INDEX
ILLUSTRATED
VOLUME NINE
P. F. COLLIER & SON COMPANY
NEW YORK
Copyright 1922
By P. F. Collier & Son Company
MANUFACTURED IN U. S. A.
The Science of the Body
BY
ERNEST G. MARTIN
Professor of Physiology, Stanford University
P. F. COLLIER & SON COMPANY
NEW YORK