BIOLOGY 



GENERAL AND MEDICAL 



BY 



JOSEPH McFARLAND, M. D. 



PROFESSOR OP PATHOLOGY AND BACTERIOLOGY, MEDICO-CHIRURGICAL 



COLLEGE OP PHILADELPHIA; FELLOW OP THE COLLEGE OF 



PHYSICIANS OP PHILADELPHIA 



WITH 160 ILLUSTRATIONS 



SECOND EDITION, THOROUGHLY REVISED 



PHILADELPHIA AND LONDON 



W. B. SAUNDERS COMPANY 

 1913 



