158 AMERICAN DAIRYING. 



device not only secures a correct sample of the 

 milk but it also secures the same per cent or 

 relative amount of milk, as it gets twice as 

 much in the sample when the weigh can is full 

 as it will when it is half full. 



Preserving samples. — Bichromate of potash 

 gives the best satisfaction as a preservative of 

 anything I have used. It keeps the cream in 

 a fluid condition and it does not adhere to the 

 cans in which the composite samples are kept. 

 With some of the preservatives the cream be- 

 comes so leathery that it requires much care to 

 secure a correct sample out of the composite 

 jar for testing. 



Danger of too much heat.— I have found it 

 necessary to heat such milk to near the point 

 of melting the fat, and when the fat is melted 

 it is very hard to get a correct sample, as the 

 oil made by melting the fat will rise so 

 rapidly that it requires quick work to catch a 

 correct sample. Do not get the impression that 

 there is any serious difficulty connected with 

 doing accurate work all along this line; it sim- 

 ply needs care and good common sense with a' 

 determination not to be hurried. 



Keep cool.— As a rule the person at the 

 weigh can has several lines of the work to keep 

 on his mind. In many cases he has the boiler 

 and engine and the separators to look after as 

 well as the weigh can. The machinery must 



