VERMONT DAIRYMEN S ASSOCIATION. 



89 



test when he took the examination. Whether in actual work 

 he does as well as he knows is another story. 



Many operators have protested against our ruling that they 

 test cream on the ground that whole milk only was delivered 

 at their creameries. We have insisted on this point for three 

 reasons. In the first place the law says, and very properly, 

 "milk and cream"; then, again, the farm separator is so com- 

 monly used, that most creameries are equipped and all must soon 

 be equipped to test cream; and, finally, there is a greater likeli- 

 hood of error in cream analysis than in milk analysis. This 

 error is largely due to the fact that when cream is pipetted — 

 particularly separator cream, or, indeed, any cream carrying 

 over twenty-five per cent of fat — it is so thick that it does not 

 flow readily. Eighteen grams is not delivered into the bot- 

 tle by measuring eighteen cubic centimeters. Then, again, the 

 cream may be frothy or filled with gas bubbles. These errors 

 cause low results, unless they are avoided by the use of a cor- 

 rection table or unless the pipette delivery is weighed. 



The correct amount of cream is most surely obtained by 

 weighing the pipette delivery. So many fail in this matter 



that I want to make it clear. 

 The apparatus needed is 

 simply a small druggist's 

 scale and a few weights. 

 The emptv cream bottle on 

 one scale is balanced by the 

 slide or weights on the other. 

 An eighteen gram weight is 

 added and the well mixed 

 cream is pipetted into the 

 cream bottle until the bal- 

 ance swings evenly. The 

 test is then proceeded with as 

 springer scale. usual. The operation is no 



more intricate than is the weighing of the butter into the tub 

 in which it is packed. It is precisedly the same thing, weighing 

 into a weighed empty package a given weight of the material 

 wanted. The extra time consumed need not be more than a 

 minute to the sample, and as a result of its expenditure far 

 greater accuracy is insured. Every patron taking separator 

 cream to a creamery should insist that the management test 

 eighteen grams of his cream, that they weigh the delivery 

 of the pipette. 



That this matter may be made the more clear two pictures 

 of cream test scales are given. The larger one i's manufactured 

 by the Springer Torsion Balance Co., 92 Reade Street, New 

 York, in accordance with the suggestions of the Maine exper- 



