Contamination of Milk. 39 



Pail A is provided with a small opening in a removable 

 top (C) to the pail. This top piece is arranged so that a layer 

 of muslin or flannel (a, a') can be stretched over opening. 

 On this is placed a layer of absorbent cotton (&), which in 

 turn is covered with another sheet of muslin. 



Pail B is provided with a removable top in the lower 

 part of which is fitted another connection .5, that is also 

 removable. This part is provided with a cotton filter (a), 

 the milk also passing upward through a wire strainer (b). 



FIG. 10. Sanitary milk pails designed to diminish introduction of hairs, etc., 

 into milk. 



The efficiency of either of these pails is apparent from 

 the data presented. 



3. Cleaning milk by centrifugal force. Another method 

 that is in quite common use is to pass the milk through 

 separators. This not only removes practically all sus- 

 pended particles of foreign matter, as dirt, hairs, epithelial 

 cells or other debris, 1 but eliminates a large part of the 

 bacteria with the centrifuge slime. By weighing the 

 skim milk, cream and slime carefully, and then determin- 

 ing the germ content of each, it is possible to compute the 



1 Backhaus (Milch Ztg., 1897, 26:358) found that 95.6 per cent of impurities were 

 thus removed. 



