TYl'KS OF 15ACTERIA FOUND IN MILK 



45 



from the cow should be used for food purposes. Gargetty 

 milk is not caused by bacteria. 



The other type of slimy milk is due to the growth of bacteria. 

 The sliminess in this case is not apparent when the milk is 

 drawn, or for a number of 

 hours afterward ; but by the 

 time the milk is from 12 to 

 24 hours old, depending 

 upon the temperature, there 

 begins to be evident an un- 

 usual change; instead of 

 souring in the normal way, 

 the milk becomes more or 

 less viscous and, finally, 

 may be extremely slimy, so 

 that it may be drawn out in 

 long threads which, when 

 dipped out with a dipper, 

 will run down in long 

 streams. (Fig. 23.) Such 

 slimy milk is apt to be 

 counted as a total loss, for 

 it is usually regarded as 

 absolutely worthless. But 

 there is no reason to think 

 that the milk is really un- 



FIG. 23 EFFECT OF SLIMY MILK BAC- 



Indeed, m TERIA UPON MILK (RUSSELL) 

 Norway the people are 



fond of such milk and frequently use artificial means to pro- 

 duce it, preferring slimy milk to the ordinary kind. In this 

 country slimy milk is thrown away, or fed only to pigs. Since 

 the sliminess does not appear until the milk is several hours old, 

 no loss ensues when the milk is used immediately. Only milk 

 distributed to consumers or kept for a day or so will be thrown 

 away because of sliminess. 



