FOODS AND NUTRITION 



393 



Rochelle salts, and 2 grams of potassium hydroxide in 

 100 grams of water. 



Cover some chopped raisins with water and after allow- 

 ing them to stand for a few minutes test the water for 

 the presence of grape sugar by heating a little of it with 

 about 10 cc. of the Fehling's solution. A reddish precipi- 

 tate indicates dextrose or grape sugar. 



Test honey, corn sirup, and cane sugar in the same 

 way. 



Contrary to a current opinion much advertised by the 

 newspapers a few years ago, glucose is a wholesome food. 

 It is not so sweet as cane sugar, with which it is frequently 

 mixed because of 

 its cheapness. We 

 buy sugar chiefly 

 for its sweetness, 

 and a pound of 

 the mixture will 

 be worth less as a 

 sweetening agent 

 than the pure cane 

 sugar. 



Sugars. - - The 

 ordinary sugar 



Of Commerce is Cutting a Crop of Sugar Cane. 



manufactured from sugar cane and sugar beets (Figure 

 351). The sugars include sucrose, maltose, and lactose. 

 Sucrose is the sugar obtained from cane, beets, and maple 

 sap. Maltose does not occur in nature, but is produced 

 by a fermentation of the starch of barley and other 

 cereals. Lactose is the sugar in milk. 



Can the presence of cane sugar be determined with 

 Fehling's solution? 



