CLINICAL BACTERIOLOGY 

 AND H^MATOLOGY : 



PART I 



BACTERIOLOGY 



SECTION I 

 APPARATUS AND PROCESSES 



THE BACTERIOLOGICAL MICROSCOPE 



THE essentials which a microscope must possess in order to 

 render it available for bacteriological work are : 

 r. 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 lower (J inch or, better, f inch), a high 

 power (J inch or thereabouts), and a T Vinch oil immersion. 



If the practitioner already possesses, a microscope made by 

 a reliable firm, and in good condition, this should be sent to a 

 maker (not necessarily the maker of the microscope in ques- 

 tion) or to a bacteriologist for an opinion as to whether or no 

 it is sufficiently firm, and has a fine adjustment good enough, 

 to justify the addition of the other parts. If this is the case it 

 should be fitted with an Abbe's condenser and an iris dia- 

 phragm; the cost should not exceed 303. or 2. But it is 

 useless to have this alteration made unless the stand is suffi- 

 ciently steady to carry an oil-immersion lens; and in most 



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