FOODS. 71 



Experiment : 



To the Barfoed's solution in a test-tube add the solu- 

 tion of dextrose and boil. What color is the precipitate? 

 What is it ? This test distinguishes dextrose from lactose, 

 maltose, and cane-sugar, which do not reduce Barfoed's 

 solution Avhen boiled with it for a short time. 



VII. SACCHAROSE, CANE-SUGAR, AND FEHLING'S SOLU- 



TION. 



Materials. A few grains of cane-sugar. 15 c.c. of Fehling's solu- 

 tion. Water. 



Apparatus. Test-tubes. Bunsen burner. 



Experiment : 



1. Boil the Fehling's solution in a test-tube. 



2. Dissolve the sugar in 10 c.c. of water. 



3. Add the solution of sugar to the Fehling's solu- 



tion and boil. What happens ? Does saccha- 

 rose reduce Fehling's solution ? 



VIII. THE ACTION OF HYDROCHLORIC ACID UPON 

 SACCHAROSE, CANE-SUGAR. 



Materials. 100 c.c. of a strong solution of cane-sugar. 10 c.c. of 

 strong hydrochloric acid. 15 c.c. of Fehling's solution. 



Apparatus. A glass flask. Bunsen burner. Ring-stand. Wire gauze. 



Experiment : 



1. To the solution of cane-sugar in the flask add 



the hydrochloric acid. 



2. Boil one hour or more and cool. 



Caution. Never add hot caustic soda or potash to an acid. 



3. Test 5 c.c. of the boiled solution for a reducing 



sugar. 



