6 BUTTER-MAKING. 
globules, at ordinary living-room temperature, are present in 
milk in a liquid form. Cooling the milk to a very low tem- 
a. Skim milk. 
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Fic. 1.—Microscopical appearance of different kinds of milk Magnifi 
300 times, (U.S, Farmers’ Bul. No. 12) ae 
perature (about 50° F.) hardens them. When the globules are 
caused to unite, as in churning, they also solidify. 
The size of the fat-globules is very minute, and varies con- 
