378 Missouri Agricultural Report. 



sample taken may be measured, because they are so nearly con- 

 stant in weight. The pipette for milk, which holds 17.6 cubic cen- 

 timeters up to the scratch, holds 18 grams of milk or,^kim milk, 

 Ibut would not hold 18 grams of cream, and the richer the cream 

 the farther below 18 grams. The sample of cream to be tested, 

 jmust then be weighed. The process is as follows : 



First — Place the cream bottle, figure 25, on one pan of the 

 :scales, figure 26, and balance the bottle by sliding those brass 

 balls forward or back. When the balance is perfect, set the 9 gram 

 weight on the opposite pan, then with the pipette drop cream, 

 which has previously been thoroughly mixed, into the test bottle 

 until the balance is again perfect, even down to the drop of cream. 



Oream Scale. 



Second — Now add about half a tablespoonful of clean, soft 

 v/ater to the cream in the bottle. 



Third — Now add the sulphuric acid, using about three-fourths 

 cf a measure. 



Fourth — Thoroughly mix the acid and cream by the whirling 

 motion as described for milk. 



Fifth — Place test bottles in machine, balance and whirl five 

 minutes, then add hot water nearly to top of neck, and whirl two 

 minutes. 



Sixth — With the same compass shown in figure 23 read the 

 column of fat in cream. Now suppose the column of fat extended 

 ■over 13V^2 spaces, the test of that cream would be 27 per cent. Re- 

 member 9 grams only, not 18, of cream were taken. With half the 

 required quantity of cream the result obtained must be doubled. 

 If the cream column extended 22 spaces the true reading would 

 be 44 per cent. Example : How many pounds of fat in 78 pounds 

 of cream which tests 36 per cent? Seventy-eight times .36 equals 

 28.08. We have then 28.08 pounds of fat in 78 pounds of cream 

 testing 36 per cent. Example: How many pounds of fat in 59 

 pounds of cream testing 32 per cent? Fifty-nine times .32 equals 

 18.88, We have then 18.88 pounds of fat in 59 pounds of cream 

 testing 32 per cent. Example: How many pounds of fat in \\ 

 pounds of cream testing 45 per cent? 



