20 MILK 



fat will collect in the neck of the bottle and the 

 percentage may be read off. It is convenient to 

 use a pair of dividers in making the reading. 

 The legs of these are placed at the upper and lower 

 limits respectively of the fat, allowance being made 

 for the meniscus; one leg is then placed at the 

 zero point and the reading made with the other. 

 Experience by analysts in various parts of the 

 world has shown that with properly graduated 

 bottles the results are reliable. As a rule, they 

 do not differ more than o.i % from those obtained 

 by the Adams process, and are generally even 

 closer. 



For great accuracy, the factor for correcting 

 the reading on each of the bottles should be de- 

 termined by comparison with the figures obtained 

 by the Adams or other standard process. 



Cream is to be diluted to exactly ten times its 

 volume, the sp. gr. taken, and the liquid treated 

 as a milk. Since in the graduation of the test- 

 bottles a sp. gr. of 1.030 is assumed, the reading 

 must be increased in proportion. 



A more acciurate result may be obtained by 

 weighing in the test-bottle about 2 c.c. of the 

 cream and diluting to about 15 c.c. The read- 

 ing obtained is to be multiplied by 15.45 and 

 divided by the weight in grams of cream taken. 



The mixture of fusel oil and hydrochloric acid 

 seems to become less satisfactory when long 



