34: Dairy Bacteriology. 



nies develop under these conditions, thus indicating the in- 

 fection that arises from this material. The introduction 

 of the dirt particles themselves, however, adds relatively 

 many more bac- 

 teria than come 

 from the hairs 

 themselves. The 

 amount of pol- 

 lution coming 

 from the coat of 

 the animal is 

 largely depend- 

 ent upon the 

 care taken in 

 bedding, and 

 even the nature 

 of the bedding 

 material has an 



effect. Expen- 3^ 9 showing the bacterial contamination arising 



ence has shown from hair. These hairs were allowed to fall on a sterile 



1 j. gelatin surface. The adherent bacteria developed 



P6at 3 readily in jjjjg m edium, and the number of bacteria 



USed for this pur- thus introduced into the milk from these hairs can be 



DOSe that the estimated by the number of developing colonies. 



bacterial life is greatly reduced, due to the antiseptic ac- 

 tion which this strongly acid material possesses. 



The amount of impurities that are often to be found in 

 milk, even after it is strained, attest beyond dispute the 

 careless methods of handling; it should, furthermore, be 

 noted that about one-half of fresh manure dissolves in 

 milk, 1 and thus does not appear as sediment. It has been 

 determined by actual tests that the daily milk supply of 



Backhaus, Milch Zeit, 1897, 2G:357. 



