A TEXT- BOOK 



of 



PHYSIOLOGY 



For 



STUDENTS AND PRACTITIONERS OF MEDICINE 



By 



RUSSELL L&LLRTON-OPITZ 



S. M., M. D., PH. D. 



Associate Professor of Physiology, Columbia University; Professorial 



Lecturer in Physiology in Teachers College and the . 



Extension Department of Columbia University 



ILLUSTRATED 



PHILADELPHIA AND LONDON 



W. B. SAUNDERS COMPANY 



1921 



