6 



BUTTER-MAKING. 



globules, at ordinary living-room temperature, are present in 

 milk in a liquid form. Cooling the milk to a very low tern- 





- . o . ^ o o / o . <S 



o 'o O v 



v-'.vv.! ; -&*--. 



o .^ .' O 



o . oo , 



o . o - eft o 



o * O . "^ . O 



v .:.-. .\- ; *" -o 



^s c^^*-^ ^o^ 



FIG. 1. Microscopical appearance of different kinds of milk. Magnified 

 300 times. (U. S. Farmers' Bui. No. 42. ) 



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- 



