SUGAR. 



37 



sugar present. The following table shows the amounts 

 of milk sugar (Q 2 H 22 On -f H 2 O) equivalent to 

 given weights of cupric oxid. The volumes of Feh- 

 ling's solution and sugar solution, must conform 

 strictly to the figures given above. 



The determination of sugar may also be made by 

 means of the polarimeter after removal of the fat and 

 proteids. This may be effected by means of a nitric 

 acid solution of mercuric nitrate as suggested by 

 Wiley. 



The mercuric nitrate solution is prepared by dissolv- 

 ing mercury in an equal weight of nitric acid of 



