A HANDBOOK 
BACTERIOLOGICAL DIAGNOSIS 
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 fivm 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 Abbé’s condenser and iris diaphragm. 
5. Three lenses, a low power (4 in. or better, 2 in,), 
a high power (% in. or thereabouts), and a 4 in. oil 
immersion. 
If the practitioner already possesses a microscope 
B 
