THE BABCOCK MILK TEST. 167 



The milk given by each cow was tested daily 

 through all the different tests from May to 

 November. During the two butter tests the 

 skim-milk, buttermilk and butter were also 

 analyzed. The amount of fat in these three 

 products should be equal to that found by the 

 tests of the milk from which they came. Dur- 

 ing these butter tests three balance sheets of 

 this kind were made daily, making a total of 

 360 accounts. 



Each of these accounts included tests of 

 twenty-five samples of milk on one side, and on 

 the other tests of one sample each of skim- 

 milk and buttermilk and an analysis of one 

 sample of butter. The difference between 

 these two records of the butter-fat was called 

 mechanical loss. Sometimes it was gain. 



Figures from the test. The complete rec- 

 ords are not yet available, but the writer has 

 312 of the total 360 comparisons which can be 

 made. These include 120 Jersey, 90 Guernsey 

 and 102 Short-horn records. They show the 

 following results: 



The number of times there was a mecnanical 

 gain was Jersey 42, Guernsey 22 and Short- 

 horn 19 per cent of the whole number of days. 

 The greatest gain observed on any day was for 

 the Jersey 1.22, Guernsey 1.31 and Short-horn 

 0.81 Ib. fat. The greatest loss was Jersey 1.93, 

 Guernsey 1.63 and Short-horn 1.26 Ib. fat. The 



