STUDY OF YUCCA ANGUSTIFOLIA 159 
Extract (3), the Green Part oj the Leaj. 
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 ioo° C. and no 0 C.4.35 per cent. 
“ ash.0.40 “ 
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.0.775 per cent. 
u “ 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- 
