298 RESULTS. [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 glycerine can be detected after 

 saponification of the oil. 



Qimntitative. 



Values obtained with seeds and seedlings of Cress. The 

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



Experiment No. 13 2 



Seeds, germi- 

 nating radicle Seedlings and 

 Seeds. protruding a remains of seed, 

 few mm. 



Oils and Fats 30-2 23-7 5-2 p.c. 



Glycerin produced 

 by saponifying oil from 

 100 grs. of material 

 dried at 100°. 3-1 grs. 1-8 grs. 0-5 grs. 



Chapter XII. p. 248. TanniMS and Glucosides. 



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 suf&cient quantity to be 

 easily detected ; and small quantities of glucose are generally 

 found. 



Experiment No. 2. 



Young and ripe fruits of Banana. Much tannin and little 

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

 fruits much sugars as well as tannins. 



