ADVANCED PHYSIOLOGY 

 AND HYGIENE 



FOR USE IN SECONDARY SCHOOLS 



HERBERT W.OtJONN, Ph.D., 



FORMERLY PROFESSOR OF BIOLOGY IN WESLEYAN UNIVERSITY 



AND 



ROBERT A. BUDINGTON, A.M., 



PROFESSOR OF ZOOLOGY IN OBERLIN COLLEGE 



REVISED EDITION 



SILVER, BURDETT AND COMPANY 



BOSTON NEW YORK CHICAGO SAN FRANCISCO 



