BIOLOGY 



GENERAL AND MEDICAL 



BY 



JOSEPH McFARLAND, M. D. 



PROFESSOR OF PATHOLOGY AND BACTERIOLOGY, MEDICO-CHIRURGICAL 



COLLEGE OF PHILADELPHIA; FELLOW OF THE COLLEGE OP 



PHYSICIANS OP PHILADELPHIA 



WITH 160 ILLUSTRATIONS 



PHILADELPHIA AND LONDON 



W. B. SAUNDERS COMPANY 



1910 



i 



