34 BACTERIOLOGY 



Gartner uses a little contrivance consisting of a cork -with 

 two glass tubes which is inserted into the mouth of the 

 test-tubes, and converts them into miniature wash-bottles. 

 The iiuid is forced out by blowing and the sediment remains 

 behind on the bottom. 



Less recently Csokor constructed a large centrifugal 

 machine marked by its fixed and perfectly even rate of 

 rotation. It is driven by water-power, and makes over 

 3,000 revolutions per minute. 



