236 Milk and Its Products. 
about 10 c. c. of warm water. Add the acid, and complete the test 
in the ordinary way. The percentage of fat will be found by the 
following proportion : 
Weight of sample 18 :: observed reading : per cent of fat; or 
18 X observer reading __ per cent of fat; 
weight of sample 
e. g.: 4.8 grams of cheese tested, showed a reading of 9.2 per cent 
fat in the test bottle. The cheese contained : 
18% 9.2 
= 34.5 per cent fat. 
4.8 
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