32 CHEESE MAKING. 
the sample contained 33 per cent of foreign (extraneous) water. 
When patrons are paid by the fat test it does not pay to go 
to the trouble of hauling water to the factory.* 
In paying for milk by the test, composite samples are tested 
as follows: 
65. Composite Samples. 
The samples should be saved from each patron’s milk every 
morning by stirring the milk in the weigh can with a dipper. 
An ounce measure is then filled with the milk, and emptied into 
a sample jar, labeled with the patron’s name or number. 
A still better way is to take the sample with 
a milk thief, which is a long tube three-fourths of 
an inch in diameter, with a valve in the bottom. 
By lowering this into the weigh can an accurate 
sample of the milk runs in at the bottom and the 
valve is closed by striking the bottom of the can. 
The tube is then drawn out and emptied through 
the upper end into the sample jar. The Scovell 
sampling tube (Fig. 18) is another convenient ap- 
paratus for sampling milk in the factory weigh-can. 
66. Milk Samples, How Pres: rved. 
A small quantity of potassium bichromate, 
enough to color a jar of milk a bright yellow, is 
put into the clean jar; this chemical will preserve 
the milk for about two weeks. 
Corrosive sublimate tablets sold by dealers in 
dairy supplies are now quite generally used and 
may give more satisfactory results; they are very 
: poisonous and must be kept away from children. 
De eicers? At the end of a week the composite sample of 
Sampling each patron’s milk is tested, and the reading of 
Tube. the Babeock test shows the percentage of fat in 
the milk supplied by the patron during the week. 
For method of making dividends according to the test, see 
Chapter XJIT. 
*For other methods of determining adulteration of milk, by watering or 
skimming, see ‘‘Testing Milk and Its Products,” 22d ed., p. 115. 
