266 Milk and lis 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 observed reading _ ^^^, ^^^^ ^^ ^^^. 

 weight of sample 

 €. g. : 4.8 grams of cheese tested, showed a reading of 9.2 per cent 

 fat in the test bottle. The cheese contained : 



^^ ^ ^-^ = 34.5 per cent fat. 

 4.8 ^ 



