ELEMENTARY PHYSIOLOGY 

 AND HYGIENE 



BY 



BUEL P. COLTON, A.M. 



AUTHOR OF 



PHYSIOLOGY : EXPERIMENTAL AND DESCRIPTIVE 



"PHYSIOLOGY, ILLUSTRATED BY EXPERIMENT" 



" PRACTICAL ZOOLOGY " 



AND 

 PROFESSOR OF NATURAL SCIENCE 



IN 



ILLINOIS STATE NORMAL UNIVERSITY 

 NORMAL, ILLINOIS 



BOSTON, U.S.A. 



D. C. HEATH & CO., PUBLISHERS 

 1904 



