PREFACE 



TO THE SECOND EDITION. 



THE fact that a new edition of this manual was 

 called for a few months after its publication, has 

 induced the author to extend its scope in the 

 hope of adding to its usefulness. 



The work has not only been revised throughout 

 and brought up to date, but, in order to admit 

 of a more concise arrangement of the species, the 

 Systematic part has been recast. 



Additional chapters have been written upon the 

 General Morphology and Physiology of Bacteria, 

 upon Antiseptics and Disinfectants, and Immunity. 



Seventy-three illustrations have been added. 

 Those not duly acknowledged as coming from 

 other sources were drawn on the wood by the 

 author from his own preparations. 



A list of references to works on Bacteriology, 

 which was not ready for the first edition, has 

 now been completed and extended. It has no 

 pretension to be a complete bibliography, but 

 being arranged as much as possible in accordance 



