156 
20% 
BUTTER-MAKING. 
ical 
25 % 
30 % 
40% 
Fig. 91.—Showing the height to which cream free from air-bubbles must be 
raised in a pipette to get 18 grams of cream. It shows that to measure 
cream in a pipette is inaccurate in 
Com. Report, 1903.) 
cream testing. 
(lowa State Dairy 
