THE PRINCIPLES 



BACTEEIOLOaT 



APRACTICAL MANUAL FOR STUDENTS 

 AND PHYSICIANS. 



BY 



A. C. ^ABBOTT, M.D., 



PBOFESSOR OF HYGIENE. AND DIEECTOE OF THE LABOEATOEY OF HYGIENE, 

 UNIVBESITY OP PENNSYLVANIA. 



FOURTH EDITION, ENLARGED AND THOROUGHLY 

 REVISED. 



With 105 Illustrations, of which 19 are colored. 



LEA BEOTHERS & CO., 



PHILADELPHIA AND NEW YORK. 



1897. 



