STUDY OF YUCCA ANGUSTIFOLIA 
157 
dish-violet-color reaction. Another portion of the carbhydrate 
filtrate residue was precipitated with neutral acetate of lead 
and filtered. The precipitate was suspended in water, de¬ 
composed by sulphuretted hydrogen, and the lead sulphide 
filtrate evaporated over a water-bath to expel all odor of sul¬ 
phuretted hydrogen. The liquid was cooled and lime-water 
added until the reaction was alkaline to litmus. A turbidity 
formed when the lime-water was added to the filtrate, and 
was not entirely cleared on the addition of dilute acetic acid. 
A neutralized portion of the lead sulphide filtrate gave a 
yellow precipitate with a ferrous salt. Oxalic acid by these 
tests was indicated, and possibly other vegetable acids were 
present in the filtrate. The carbhydrate filtrate residue was 
examined for tannin, and with a negative result. Calcium 
oxalate was separated. 
Extract (2), the Wood of the Root. 
The powder used in the alcoholic maceration was thoroughly 
dried, and replaced in the percolator. A measured quantity 
of cold distilled water was allowed to percolate slowly through 
the powder. The extract was colored, and slightly acid in re¬ 
action. A definite volume of the extract was evaporated, dried, 
and weighed. A known weight of the residue was incinerated 
in a weighed covered porcelain crucible, and the ash deter¬ 
mined. The ash was white and incompletely soluble in water. 
TOTAL SOLIDS. 
Aqueous residue dried between ioo° C. and no° C.12.10 per cent. 
“ ash. 1.74 “ 
Gum. 
A certain quantity of the aqueous extract was mixed with 
two volumes of stronger alcohol (Squibb’s). The mixture was 
allowed to stand for twenty-four hours, and the precipitate 
which formed was collected on a weighed filter. It was dried, 
and weighed. The precipitate and filter were incinerated in 
