94 



The next Table has been arranged to show the relative cfl&cieney of the creaming 

 which resulted from the different treatments of the milk, in each of the four experi- 

 ments of the series. The comparison between the ditferent treatments requii-es this 

 explanation: The different treatments were given to the milk of the same cows upon 

 four consecutive weeks. That did not afford a basis, for a comparison of the effects 

 of different setting conditions on milk, as sufficient or as reliable as when different 

 portions of herd milk, from the same cows on the same day, are subjected to different 

 setting conditions for creaming. This experiment provided for treating the milk 

 from the different groups alike on the same days, as the comparison was between 

 the milks of the different groups, and not between the different methods of setting. 



Table IX shows the percentage of unrecovered fat, which was left in the skim 

 milk in the case of each of the three groups of cows, during each of the four experi- 

 ments: — 



Table IX. 



These four experiments in the setting of milk in deep-setting pails, with 36 set- 

 ting tests for the milk of each of three groups of cows, show : — 



(1.) That 31-11 per cent of the butter-fat was not recovered from the skim- 

 milk, in the case of the group of cows which had been milking for periods of from 

 8 to 11 months each. 



(2.) That 2*7"35 per cent of the butter-fat was not recovered from the skim- 

 milk, in the case of the group of cows which had been milking for periods of from 

 5 to 7 months each. 



(3.) That 15-93 per cent of the butter-fat was not recovered from the skim- 

 milk, in the case of the group of cows which had been milking for periods of from 

 1 to 3 months each. 



Experiment in Deep-setting, as compared with Shallow-pan Setting, with the Milk from 



Cows of Groups I and II. 



The cows which composed Groups I and II were the same as those described 

 for the series of experiments which have been recorded in Tables V to IX. A por- 

 tion in each case was set in an ordinary shot-gun, deep-setting pail, of 8^ inches 

 diameter, set in water without ice, of a temperature of 45" Fahr,; another portion 

 of the mixed milk was set in shallow-pans to a depth of 2^ inches. 

 The milk was set in each case for a period of 22 hours. 

 The test was continued for five days — 8th to 12th December, 1891, 



