STUDY OF YUCCA ANGUSTIFOLIA 159 



Extract (3), the Green Part of the Leaf. 



The residual powder was dried from all traces of alcohol, 

 and cold distilled water was allowed to slowly percolate through 

 the powder. The extract was colored, and slightly acid in re- 

 action. A definite volume of the extract was evaporated, dried, 

 and weighed, and the ash calculated from incinerating a known 

 weight of the residue. 



TOTAL SOLIDS. 



Aqueous residue dried between 100 C. and 110 C 4.35 per cent. 



" ash 0.40 " 



Gum. 



One volume of the aqueous extract was mixed with two 

 volumes of stronger alcohol. The precipitate was collected 

 after twenty-four hours, washed with 66 per cent, alcohol, 

 dried, and weighed. The precipitate and filter were incin- 

 erated, and the ash estimated. 



Weight of precipitate by stronger alcohol yielded -775 per cent. 



ash yielded 0.125 " 



Carbhydrates. 



The gum filtrate and wash alcohol were concentrated at a 

 low temperature, and the residual liquid mixed with four vol- 

 umes of stronger alcohol. The resulting precipitate was rapidly 

 filtered and collected. The percentage of carbhydrates was 

 estimated gravimetrically from a copper solution in the usual 

 way. It amounted to 0.525 per cent. 



Carbhydrate Filtrate. 



The filtrate was evaporated to dryness. A part of the resi- 

 due was boiled with 83 per cent, alcohol. On cooling, a pre- 

 cipitate formed. It was identified by the usual tests as saponin. 

 Another portion of the residue was precipitated with basic 

 acetate of lead. The lead precipitate was decomposed by sul- 

 phuretted hydrogen, the solution filtered, and the filtrate evap- 



