Comparative 

 ANIMAL PHYSIOLOGY 



C. LADD PROSSER, Editor 



By 

 DAVID W. BISHOP 



Professor of Physiology, University of Massachusetts 



FRANK A. BROWN, Jr. 



Professor of Biology, Northwestern University 



THEODORE L. JAHN 



Professor of Zoology, University of California at Los Angeles 



C. LADD PROSSER 



Professor of Physiology, University of Illinois 



VERNER J. WULFF 



Assistant Professor of Physiology, University of Illinois 



Illustrated 



W. B. SAUNDERS COMPANY 



Philadelphia • 1950 • London 



