A HANDBOOK 



OF 



BACTERIOLOGICAL DIAGNOSIS 



FOR 



PRACTITIONERS. 



PART I. 

 APPARATUS AND PROCESSES. 



THE BACTERIOLOGICAL MICROSCOPE. 



The essentials which a microscope must possess in 

 order to render it available for bacteriological work 

 are: 



1. A firm and rigid stand and stage. 



2. A firm, accurate, and delicate fine adjustment. 



A microscope which possesses these may be made 

 available for bacteriological work by the addition of the 

 necessary parts, but one that is deficient in these 

 respects is useless. 



3. A convex and a flat mirror. 



4. An Abbe's condenser and iris diaphragm. 



5. Three lenses, a low power (-J in. or better, f in.), 

 a high power (^ in. or thereabouts), and a T y in. oil 

 immersion. 



If the practitioner already possesses a microscope 



