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ILLINOIS DAIRYMEN'S ASSOCIATION. 



systems. The reason why it does not is because from a human point of 

 view, they are not able to produce disease. They are capable of chang- 

 ing the nature of milk to a very great extent. 



It is very important for the dairyman to know the nature of infection, 

 and in order to bring this before you in a way that it can be more readily 

 appreciated, I have brought down with me a few slides which we will 

 throw on the screen as illustrations. 



SLIDE NO. 1— BACTERIA AND FAT GLOBULES. 



NO. 1. — Microscopic appearance of ordinary milk showing fat, globules, 

 and bacteria in the milk serum. The cluster of bacteria on left side 

 are lactic acid forming germs. 



Suppose the Washington monument was made of bricks of ordinary 

 size — a structure 70 feet square at the base and 500 feet high. If every 

 brick in the structure represented a germ there is often enough bacterial 

 life in a single teaspoonful of milk to equal in number the bricks which 

 would be put in such a structure, in numbers about 29,900,000. 



In what way do we account for this enormous discrepancy between 

 the condition of the milk as it exists in the milk glands of the cow and as 

 it passes through the weigh can. This great variation is due to two fac- 



