270 EXPERIMENTS [CH. XUI 



Therefore 100 c.c. of extract contain, 

 Glucose '100 gr. 

 Cane-sugar -038 gr. 

 Maltose -081 gr. 



Experiments on Sugars. 

 Qualitative. 



I. Examine leaves of Tropceolum majus for glucoses, 

 cane-sugar, maltose. 



Extract the dry material (1) with benzene, (2) with 

 alcohol, (3) with cold water. 



After removal of tannins, etc. from extract (2) mix the 

 solution with extract (3) and examine as directed on 

 p. 264. 



II. Examine (a) leaves of actively growing Beta 

 vulgaris which have been killed with chloroform and dried. 



(&) roots of do. which have been stored at the end of 

 summer. 



Examine as directed for the leaves of Tropseolum. 



Quantitative. 



I. Compare the amounts of fermentable sugars (calcu- 

 lated as glucoses) in the materials used for Qualitative, II. 



Extract at once with cold water and use the methods 

 described on p. 20 after removal of tannins by shaking 

 with lead carbonate (see p. 254). 



II. Compare amounts of sugars in (a) leaves of Beta 

 vulga/ris which have been killed by chloroform whilst in a 

 state of active assimilation. 



