LEFFMANN-BEAM METHOD. 



27 



tent, in the United States, which has been assigned to 

 J. E. Lonergan, of Philadelphia. 



The test-bottles, the form of which is shown 

 in the cut, have a capacity of about 30 c. c., 

 and are provided with a graduated neck, each 

 division of which represents one-tenth per 

 cent by weight of butter-fat. 



15 c. c. of the milk are measured into 

 the bottle, 3 c. c. of a mixture of equal parts of 

 amyl alcohol and strong hydrochloric acid added, 

 mixed, the bottle filled nearly to the neck with 

 concentrated sulfuric acid and the liquids mixed 

 by holding the bottle by the neck and giving it 

 a gyratory motion. The neck is now rilled to about 



