54 



DAIRY LABORATORY GUIDE 



jacket E with cool water to within one inch of the 

 top. Remove the stopper F. 



Distilling off the Water. Caution: Be sure that 

 the glass stopper F is removed. 



Place the apparatus over the flame of the burner, 

 applying heat to the bottom of the flask A. In a 

 short time the butter will melt, running from the 

 parchment paper into the amyl reagent. The water 



Fig. 36. — Heating the sample of butter with 

 amyl reagent over alcohol flame. 



in the sample then boils and passes as steam into the 

 tube C, where it is condensed and trapped. Watch 

 the condensation in the graduated part of the tube 

 C, and do not let the steam get higher than the 

 15 per cent mark. If it goes higher than this, remove 

 the flame, as there is danger of water being lost. If 

 there is any indication of liability of the mixture in 

 the flask A foaming over, remove the flame. Foam- 



