THE MOJONNISR TEST 287 



(6) Weigh the cross with the pipettes containing the milk on 

 chemical balance accurately to .0001 grairu Run milk from pipette 

 into proper flask, or 3-inch dish if making solids test. The pipettes 

 may be distinguished by the number upon each cross. Replace 

 pipette and weigh again. Difference in weight gives weight of sam- 

 ple. Repeat until all samples are run into proper flasks, and into 

 weighed solids dishes if solids are determined along with the fat. 



For fat in Sweetened Condensed Milk use a five-gram sample. 

 The five-gram pipette delivers approximately five grams between 

 the five-gram mark and the base of the bowl of the pipette- 



Some operators prefer to mix 200 grams of sweetened con- 

 densed milk with 200 grams of water, weighing these carefully upon 

 a Harvard trip scale sensitive to .1 gram. In this case care must be 

 exercised to obtain the exact weight of both milk and water and to 

 stir these thoroughly with glass or metal rod before taking sample. 

 A tall tumbler, a one-pound bottle or a quart cup make good con- 

 tainers in which to make mixture. A ten-gram sample of this mix- 

 ture is used. This is best weighed out by using two five-gram 

 pipettes on weighing cross. 



For total solids weigh out y 2 (.5000) to ft (.7500) gram of 

 this mixture. If the undiluted milk is used take as nearly (.2500) 

 gram as possible. 



For regular 8 per cent plain bulk condensed milk use same size 

 samples and treat same as evaporated milk. For 12 per cent super- 

 heated condensed milk mix 100 grams milk with 300 grams water 

 upon Harvard trip scale. Weigh ten-gram sample of this mixture 

 into flask for fat and a two-gram sample into solids dish for solids. 

 Multiply percentages obtained by four for correct percentages, when 

 a 1 to 4 dilution is made- 



FRESH MILK, SKIM MILK, WHEY, BUTTERMILK 



BUTTER FAT DETERMINATION 



(1) Use the ten-gram pipettes for measuring out ten grams 

 of milk into cleaned but not necessarily dried Mojonnier extraction 

 flask. Use only ten-gram pipettes furnished with tester and do not 

 use 10 c.c- pipettes. The pipette is graduated to deliver ten grams 

 of milk after allowing all milk to run out and letting it drain for 

 fifteen seconds longer, then blowing gently to remove last drop. 



