PREFACE TO SECOND EDITION. 



THE First Edition of " Bacteria " being nearly ex- 

 hausted at the end of six months from date of publica- 

 tion, the writer has taken advantage of the opportunity 

 which this favorable reception of the work hac given 

 him, and has revised and added to the text, with a view 

 to making it still more worthy of a place in the libraries 

 of physicians, and of others interested in this important 

 field of investigation. Several of the plates have also 

 been remodelled, and new photo-micrographs introduced 

 in place of some of those in the first edition, which have 

 been excelled by later efforts. The bibliography has 

 also been brought up to date. 



It has been thought best in the present edition to 

 remove the name of Dr. Magnin from the foremost 

 place upon the titlepage, inasmuch as the present writer 

 has contributed more than two-thirds of the text, and as 

 the illustrations from nature photo-micrographs are 

 all his work. The appreciation in which Dr. Magnin's 

 systematic account of the bacteria is held is shown, 

 however, by the fact that we have not attempted to 

 re-write this portion of the work, at the head of which 

 a separate titlepage, bearing Dr. Magnin's name, will 

 be found. 



JOHNS HOPKINS UNIVERSITY, 



BALTIMORE, MD., July 28, 1884. 



M123312 



