89 



PARTICULARS OF EXPERIMENTS. 



In the course of the experimental work of the year a great mass of valuable 

 data has been accumulated in the records. As far as experiments have been com- 

 pleted, or even advanced suflSciently to furnish useful guidance for dairymen in their 

 practice, they will be reported upon. The tests for comparison between the centri- 

 fugal cream sepai-ators and the setting methods are not ready to be reported on in 

 full, as it is considered desirable to make a record of the results which are found 

 during every month of the year before any definite conclusion is announced. 



Instead of burdening the pages of the report with the details of single tests only, 

 a statement of the average results of from 4 to 12 tests will be presented in most of 

 the different experiments. Our herd of milking cows contains animals of seven 

 different breeds, beside grade milch cows. When not otherwise specified, the milk 

 used in the experiment was mixed herd milk. 



Experiments in Deep-setting of Milk at different Temperatures. 



The test was conducted for six days — 28th May to 4th June — and included six 

 settings of morning milk and six settings of evening milk in each case. The 

 whole quantity of milk used was herd milk, and was thoroughly mixed in a large 

 vessel befoi e it was divided into three lots. The setting period was 22 hours. Table 

 I shows the average results from the 12 tests: — 



Table 1. 



Temperature of Milk when set. 



Quantity of milk set Lb. 



Per cent of butter-fat in milk 



Temperature of water Fahr. 



Quantity of skim-malk Lb. 



Per cent of butter-fat in skim-milk 



Quantity of fat in whole milk. Lb. 



do left in skim-milk 



Percentage unrecovered 



78° Fahr. 



35 



3-48 

 49° 



30-25 

 0-71 

 1-22 

 0-214 



17-60 



This experiment shows that the loss of butter-fat — unrecovered from the skim- 

 milk — was only -59 of 1 per cent greater, when milk was set 88° Fahi-., than when 

 it was set 98° Fahr.; and that the loss of unrecovered butter-fat was 2*53 percent 

 greater when milk was set at 78° Fahr, than when it was set at 98° Fahr. 



Experiment in Immediate vs. Delayed Setting of Milk. 



This test was conducted for six days — from 27th July to 2nd August — and included 

 six settings of morning milk and six settings of evening milk in each case. The 

 milk was herd milk, and was mixed immediate Ij' after milking, before it was divided 

 into two lots. One lot was set at once in a deep-setting pail, in ice water, of a tem- 

 perature of 38° Fahr. ; another lot was left in a pail in the dairy room for one hour, 

 and was then set in ice water, under conditions precisely similar. The following 

 Table shows the average results from the morning and evening tests : — 



