96 ELEMENTS OF GENERAL SCIENCE 



escaping by the elastic dough, but stretches the dough and 

 makes the bread light. The alcohol evaporates in the baking. 

 110. Bacteria in cultivation. On account of the value of 

 certain kinds of bacteria they are sometimes cultivated, in 

 order to have them always on hand. For instance, it has 

 been found that if milk is sterilized and then inoculated with 

 certain kinds of bacteria, the cheese made from tins milk will 

 always have the desired flavor, whereas if this is not done 

 the flavor will depend upon the bacteria that may chance to 

 get into it from the air, and the results may not be at all 

 desirable. It is quite probable that in the future we shall 

 domesticate manv kinds of bacteria for which we find use. 



