NUTRITIONAL 

 PHYSIOLOGY 



BY 



PERCY GOLDTHWAIT STILES 



ASSISTANT PROFESSOR OF PHYSIOLOGY IN SIMMONS 

 COLLEGE ; INSTRUCTOR IN PHYSIOLOGY AND PERSONAL 

 HYGIENE IN THE MASSACHUSETTS INSTITUTE OF TECH- 

 NOLOGY, BOSTON 



ILLUSTRATED 



PHILADELPHIA AND LONDON 



W. B. SAUNDERS COMPANY 



