vili PREFACE. 
excellent works on the science of bacteriology which are 
current at the present time. The practitioner is strongly 
recommended to supplement the very meagre details 
concerning the life-history and pathogenic action of the 
bacteria which are dealt with here by a study of one 
of these textbooks. Muir and Ritchie’s admirable 
“Manual of Bacteriology,” Crookshank’s ‘“‘ Bacteriology 
and Infective Diseases,’ Hewlett’s ‘ Bacteriology,” 
Klein’s ‘ Micro-organisms and Disease,” McFarland’s 
“Textbook upon the Pathogenic Bacteria,” or Curtis’s 
“‘ Essentials of Practical Bacteriology” are all suitable 
for this purpose, and a perusal of any one of them will 
be both pleasurable and profitable to every medical 
man. 
Several illustrations have been borrowed from sources 
mentioned in the text and for the loan of these the 
author wishes to express his best thanks to the respec- 
tive authors and publishers. His best thanks are also 
due to Messrs. Baird and Tatlock, Swift and Son, 
Zeiss, Leitz, Hawksley, and Hearson, for kindly pro- 
viding illustrations of apparatus made by them. 
