PREFACE. 



This little work on Practical Bacteriology was written 

 by me to serve as a sliort text-book for my bacterio- 

 logical course at the Technical High School^ in order 

 to diminish the amount of verbal teaching, and to 

 avoid the continual repetition of necessary directions. 

 The excellent works of Hiippe, Frankel, and Giinther 

 are too voluminous for this purpose, being liable to 

 confuse the beginner from their very fulness of detail. 

 If, however, the student wishes to go more deeply into 

 the subject, he will find these works indispensable. 



In consequence, I have, in the following pages, only 

 mentioned the most important methods, and amongst 

 the innumerable ways of staining preparations have 

 only described the most convenient for use. In ad- 

 dition, I have restricted the amount of material to be 

 used as much as possible, so that the subject-matter 

 contained in "Chapters I.-XIII., at any rate, should be 

 mastered in one term. The subsequent chapters are 

 meant rather to be used in special individual cases, 

 and on that account those things which are of practi- 

 cal use to the physician or chemist have been treated of 



