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 0.1 % 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 accurate result may be obtained by 
weighing in the test-bottle about 2 c.c. of the 
cream and diluting to about 15 ec. 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 
