54 



applip:d bacteriology 



ai^plications in bacteriological research, anroug wliich 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 he used to separate blood-corpuscles from 

 fluids, fine precipitates from stains, etc. There are many 

 types of centrifugal machines in use, but ^ye have found the 

 machine devised by Messrs. Leffmann and Beam for the 



Fig. 11. — Centrifugal Machine. 



! inexpensive, and in every 



ses. This machine can be 



3volutions per minute. 



ler 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 "lass 



rods to form handles for convenience in holding. This is 



easily done by means of a blowpipe flame. A looped 



