CLINICAL BACTERIOLOGY 

 AND HEMATOLOGY 



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 : 



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 Abb6's condenser and iris diaphragm. 



5. Three lenses, a low power (^ inch or, better, | inch), a high 

 power (^ inch or thereabouts), and a Jj^-inch 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 question) 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 diaphragm ; the cost should not 

 exceed 30s. or £2.. But it is useless to have this alteration made 

 unless the stand is sufficiently steady to carry an oil-immersion 



