104 BUTTER-MAKING. 



Average Sample. It is sometimes desirable to obtain an 

 average test of the milk from a whole day's delivery. This 

 can be obtained in two ways: First, by taking a sample from 

 each patron's milk with a sampling-tube, and putting it all 

 together in one jar. The result represents an average test, pro- 

 viding the samples have been correctly taken. Second, an aver- 

 age test can be had by boring a small hole in the conductor-head. 

 When the milk passes over this hole, a small portion of it 

 drops through. A vessel of some kind can be put underneath 

 to catch the drops. Such a drip-sample will represent very 

 accurately the average quality of the milk received at the 

 creamery. If it is desirable to keep this sample, a preservative 

 can be added to it. 



Composite Sampling without the Use of Preservatives. 

 Pipettes can be obtained holding 5.87 c.c. of milk. These are 

 one-third the size of the ordinary 17.6 c.c. pipette used for 

 the Babcock test. With this small pipette a sample may be 

 taken every day from each patron's milk, during three suc- 

 cessive days, and emptied into the same test-bottle each 

 day. At the end of three days the samples may be tested 

 and the bottles cleaned, ready for use again. 



Accurate composite samples may be obtained in this way, 

 providing the sample in the pipette is correctly taken each 

 day. No preservative is needed. The preservatives are added 

 to the composite samples to prevent curdling. The test-bottles 

 may be placed on a shelf, or preferably in a rack made to hold 

 them. They should be marked in such a way as to identify 

 them. A good way is to mark them the same as the com- 

 posite jars, the number on the jar corresponding to the number 

 on the milk-sheet for each patron. 



