76 Testing Milk and Its Products. 



In either case the weight of a certain measure of cream 

 is diminished. 



87. As an illustration of the effect of the preceding 

 factors on the amount of cream measured out by a Bab- 

 cock 17.6 cc. pipette, the following weighings of separa- 

 tor cream are given (columns (a) ). The cream was in 

 all cases fresh from the separator; it was weighed as de- 

 livered by the pipette into a Winton cream bottle (91), 

 and the test proceeded with at once; the specific grav- 

 ity of the cream was determined by means of a picnome- 

 ter. The data given are in all cases averages of several 

 determinations; the samples of cream have been grouped 

 according to their average fat contents. 1 



The figures 2 given in columns (b) and (c) are calcu- 

 lated from the per cent, of fat and total solids in creams 

 containing different per cents, of fat. Column (c) shows 

 approximately the corrections to be added to readings of 

 cream tests when the adhering cream is washed from the 

 walls of a 17.6 cc. pipette, these washings added to the 

 test bottle, and the test completed in the usual way. 

 Weight of fresh separator cream delivered by a 11.6 cc. pipette. 



1 For influence of condition of cream on the amount measured out 

 with a 17.6 cc. pipette, see also Bartlett, Maine exp. sta., Bull. 31 (S. S.). 



2 Hoard's Dairyman, 1900, p. 355. 



