Tut Mosonnirkér Tes'1 369 
cross. Replace pipette and weigh again. Difference in weight 
gives weight of sample. Repeat until all samples are run into 
proper flasks, and into weighed solids dishes if solids are deter- 
mined alone 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 .} 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 containers in which to make mixture. \ ten- 
gram sample of this mixture is used. ‘This is best weighed out 
by using two five-gram pipettes on weighing cross. 
For total solids weigh out 1% (.5000) to 34 (.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 
superheated condensed milk mix 100 grams milk with 300 crams 
water upon [larvard 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 cor- 
rect 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 Mojonmier extrac- 
tion flask. Use only ten-gram pipettes furnished with tester 
and do not use 10 c.c. pipettes. he 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. The pipette must be perfectly clean 
and dry before being used. Wash frequently with sulphuric acid, 
water, alcohol and ether to insure having a clean pipette. 
