RECEIVING, SAMPLING, AND GRADING. 95 
sample, the test of that composite sample will be 3+5=2, 
or 4%. According to this test, these 300 pounds: of milk 
delivered will contain 12 pounds of butter-fat. In reality 
6 pounds of fat were delivered in the 200 pounds, and 5 pounds 
of fat in the 100 pounds, making a total of 11 pounds of fat. 
Thus we see that the dipper method is not reliable, and in this 
<< a 
+90 
40 a0 
L zo 
305 00 
50 
204 L 10 
L so 
10-1 20 
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“| 
Fic. 55.—The McIXay cream and Fic. 56.—Cream sampling-tube. 
milk sampler. 
case the patron was paid for 1 pound of butter-fat too much 
for the two days’ delivery. If the sample taken from the 
200 pounds of milk had been twice as great as that taken from 
the 100 pounds of milk, then the composite test would have 
been perfect, no matter whether it had been taken with a 
dipper or with a sampling-tube. If the same weighing-can 
is used every day, then an exact proportion for a sample can be 
