INTRODUCTION. 



Bactbeiology is a very wide subject ; However, only a 

 Small portion of it need be dealt with in a practi- 

 cal course which, is not intended for the training of 

 specialists. It frequently happens to both physician 

 and chemist that a few bacteriological experiments 

 are necessary in the course of his ordinary work, and 

 hence that he requires to understand thoroughly the 

 most important methods of manipulation. This book 

 is only intended to supply this need, and the subject 

 is, I hope, treated in a manner which is easily compre- 

 hensible by the non-specialist. It only remains to 

 mention the best way of furnishing the laboratory, the 

 places where the necessary appliances can be obtained, 

 and the most important literature on the subject. 



Necessaet Appaeatos. 



1. The first and most important instrument is the 

 microscope. If the student intends to devote himself 

 with some assiduity later on to accurate bacteriological 

 work, it is best for him to choose at the outset an in- 



1 B 



