DETERMINATION OF FATS. 



37 



fats is determined. At a temperature of 1754 degrees C. 

 no correction is necessary. Otherwise, for each one-tenth 

 degree above this point add to the areometer reading 

 one degree, or for each one-tenth below, deduct one 

 degree. 



For very poor milk (low in fats), at times, a clear ether 



Fig. 3. 



fat solution will not separate -out, but forms a gelatinous 

 mass. In such cases Soxhlet suggests the addition of 

 from 20 to 25 drops of a soap solution before mixing 

 with ether. The soap solution for this purpose is 

 prepared by heating on a water bath 15 grams 

 of stearic acid^ with about 25 c. c. of alcohol (96 per cent) 

 'An ordinary stearin candle will answer the purpose. 



