316 EESULTS. [APP. I 



saponifiable by aqueous or alcoholic potash. The exact chemical 

 nature of the unsaponifiable substances is uncertain, but they 

 are probably not plastic. 



Considerable quantities of glycerin can be detected after 

 saponification of the oil. 



Quantitative. 



Values obtained with seeds and seedlings of Lejndium. 

 The p.c. are calculated for material dried at 100° C. 



Qualitative. 



Experiment No. 1. Willow Bark. 



Much tannin is generally present, which is best removed 

 by hide powder ; but shaking with lead carbonate will also 

 remove the tannin completely if the process is repeated several 

 times. 



Salicin is commonly present in sufficient quantity to be 

 easily detected ; and small quantities of glucose are generally 

 found. 



Experiment No. 2. 



Young and ripe fruits of Musa. Much tannin and little 

 sugars may be expected in the young fruits, but in the old 

 fruits much sugars as well as tannins. 



