156 



BUTTER-MAKING. 



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 cream testing. (Iowa State Dairy 

 Com. Report, 1903.) 



