INOCULATING WIRES 



49 



applications in bacteriological research, among which may 

 be mentioned the separation of bacteria from liquids when 

 held in suspension, as in the case of tubercle bacilli in 

 milk. It can also be used to separate blood-corpuscles 

 from fluids, fine precipitates from stains, etc. There 

 are many types of centrifugal machines in use, but we 

 have found the machine devised by Dr. Gerber for the 



Fig. 10. — Centeifugal Machine. 



estimation of fat ia milk to be inexpensive, and in every 

 way suitable for general purposes. This machine can be 

 driven up to the rate of 3,000 revolutions per minute. 



Inoculating Wires. — A number of these should be to 

 hand, both straight and with small loops at the end. 

 They are best made of fairly stout platinum wire, about 

 3 inches long, the ends of which are fused into glass 

 rods to form handles for convenience in holding. This is 



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