MISCELLANEOUS. 347 



were kept sweet by placing in each jar about half a gram of potassium 

 dichromate. 



In the laboratory, which was located at the Model Dairy in the 

 Agricultural building, two tests were made of all the samples, the per- 

 centage of fat being determined by means of the Babcock test and the 

 other solids by means of a lactometer reading. All tests were performed 

 in duplicate ; each set being conducted independently by two chemist.-,. 

 From the laboratory, the per cent readings of fat and solids not fat were 

 sent to the offices. Multiplying these by the total milk yield in pounds 

 for the corresponding day gave the production of each member of the 

 herds. Unlike the test at Chicago, butter was not churned during this 

 demonstration, all calculations being based on the amount of butter fat 

 and estimated butter, making allowance for over-run and loss in skim- 

 ming and churning. The assumed over-run was seventeen per cent, or 

 one hundred pounds of butter were allowed for every eighty-three pounds 

 of butter fat. The loss due to skimming and churning was placed on a 

 graduated basis, more being deducted for poor milk than rich milk. 



Awards were made in three classes : 



Class A. — "For the demonstration of the economic production of 

 butter fat and butter." The estimated butter was valued at 25 cents per 

 pound. This class w^as entered by 25 Jerseys, 15 Holsteins and 5 Brown 

 Swiss. 



Class B. — "For the demonstration of the economic production of 

 milk for all purposes." The butter fat was valued at 30 cents per pound 

 and solids not fat at 3 cents per pound. This test was entered by 25 

 Jerseys, 25 Shorthorns, 15 Holsteins and 5 Brown Swiss. 



Class C. — "For demonstration of all products of the cow." In this 

 test 40 per cent was allowed for dairy products, 35 per cent for the meat 

 making indications of the cows, and 25 per cent for the calves, judged 

 on the beef basis. The products were valued as follows : Butter fat 

 30 cents per pound, solids not fat 3 cents per pound and gain or loss in 

 live weight of cows 4 cents per pound. This test was entered by 25 

 Shorthorns, 5 Holsteins and 5 Brown Swiss. 



Awards in classes A and B, were made in the following manner : 

 Each cow was credited with the dairy products that the books showc-fi 

 that she had given, according to the values given above. From this was 

 deducted the value of her feed according to the appended table, liie 

 difference gave the net profit due her, and the size of the net profit de- 

 termined her comparative standing in her class. 



