STUDY OF YUCCA ANGUSTIFOLIA 141 



it did not clear up on warming. Hydrochloric acid made a 

 muddy mixture with the alcoholic solution. The ethereal resi- 

 due was not entirely soluble in acetic ether; the latter sepa- 

 rated coloring matter from it. The ethereal residue insoluble 

 in acetic ether and freed from coloring matter (chlorophyll) 

 was a resinous substance. It melted at 80 C. The resin was 

 boiled with absolute alcohol, and on throwing the alcoholic 

 solution into cold water it was precipitated as a white cloud. 

 It was not saponified. 



Extract (4), Yellow Base of Leaf. 



The residual powder from the petroleum spirit macera- 

 tion was dried and extracted with stronger ether. The ether 

 extract was a turbid yellow liquid, slightly acid in reaction. 

 On evaporating the ethereal extract at the ordinary tempera- 

 ture a reddish-yellow granular solid remained. It melted at 

 79 C. For the determination of total solids extracted, a defi- 

 nite volume of the extract was evaporated, dried, and weighed. 



I. 



TOTAL SOLIDS. 



Ethereal residue dried at 100 C 1.7 per cent, of solids. 



" 110 C 1.7 " " " 



oo " " loss. 



The ethereal residue was treated successively with distilled 

 water, alcohol, and ether. 



II. 



Substances soluble in ether and water 0.8 per cent. 



" " ether and alcohol 0.4 



" " water and alcohol 0.5 



Total solids 1.7 " 



The aqueous extract gave a neutral reaction with litmus. 

 Negative results followed examination for tannin, gallic acid, 

 glucosides, alkaloids, and any compounds containing nitrogen. 



