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PREFACE TO THE FIFTH EDITION. 



THE progress in baoteriology during the last few years 

 has involved more or less radical changes in many depart- 

 ments of the science. Recent work on such subjects as 

 immunity, tuberculosis, dysentery, yellow fever, the bu- 

 bonic plague, and other infectious diseases has rendered 

 obsolete many portions of any but the most modern books, 

 and in countless minor details the teaching of to-day differs 

 from that of even a few years ago. 



In this revision the attempt has been made to reflect as 

 faithfully as possible the present status of bacteriology 

 without overstepping the limits set by the scope of a book 

 intended primarily as an aid to students. Much assist- 

 ance has been derived from the " Manual of Bacteriol- 

 ogy" of Muir and Ritchie, and from F. C. Wood's 

 "Laboratory Guide to Clinical Pathology." 



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