2 BACTERIOLOGICAL DIAGNOSIS. 



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 



FIG. i. Bacteriological Microscope. 



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 305. or 2. But 



