vi] THE BACTERIA OF MILK in 



use of children that is, where perfect sterilisation 

 is desirable the milk should be previously submitted 

 to the action of the centrifugal separator. He asserts 

 that in the slimy residue which is separated from 

 the milk in this way most of the micro-organisms 

 present in the milk, and especially those possessing 

 great resistant properties, are to be found, and may 

 thus be removed from the milk and render its 

 subsequent sterilisation much easier. On the other 

 hand, it has been asserted that in separation by 

 centrifugal force, the cream receives the greatest 

 number, and that the milk becomes much more 

 largely charged with bacterial life, from the air, 

 which is sucked in in such large quantities into the 

 machine when in operation. According to 0. Lugger, 1 

 one litre of milk containing 2,050 millions of germs, 

 on being passed through a centrifugal separator, had 

 these germs distributed in the various products, in 

 the following proportions, viz. 1,700 millions in the 

 cream, 560 millions in the butter -milk, and 18 

 millions in the dirt. It seems to be true, however, 

 that one disease -producing germ generally separates 

 out in the dirt, viz. the tubercle bacillus. It is not 

 necessary to enter into a discussion of the various 

 methods which have been suggested by Soxhlet, 

 Hueppe, and others, for effecting sterilisation of milk 

 for household purposes, etc. 



1 See Minnesota Experiment Station Record, 1893, p. 285. 



f^ OF THE 



(UNIVERSITY; 

 / \^c/ 



