STUDY OF YUCCA ANGUSTIFOLIA 161 
of it was evaporated, dried, and weighed. The ash was de¬ 
termined from a part of the aqueous extract residue . 
TOTAL SOLIDS. 
Aqueous residue dried between ioo° C. and no° C.11.35 per cent. 
' “ ash... 3.10 “ 
Gum. 
One volume of the aqueous extract was mixed with two 
volumes of stronger alcohol. The precipitate was collected, 
washed with 66 per cent, alcohol, dried, and weighed. The 
ash was calculated from incinerating the precipitate, and de¬ 
ducting the filter. 
Weight of precipitate by stronger alcohol yielded.3-85° per cent. 
“ “ ash yielded.0.676 “ 
Carbhydrates. 
The filtrate and wash alcohol from the gum precipitate were 
concentrated at a low temperature. The residual liquid was 
mixed with four volumes of stronger alcohol, when a precipi¬ 
tate formed, and was rapidly filtered off. The carbhydrates 
were dissolved in water boiled with dilute acid, and the liquid 
rendered alkaline and heated over a water-bath with Feh- 
ling’s solution. The amount of carbhydrates was estimated 
gravimetrically in the usual way. It gave 2.95 per cent. 
Carbhydrate Filtrate. 
The filtrate residue was examined for glucose, and traces 
of it vrere present. The filtrate residue was precipitated with 
acetate of lead, and the lead precipitate was dissolved in water 
and decomposed by sulphuretted hydrogen. The lead sul¬ 
phide filtrate was tested qualititatively for organic acids, and 
a turbidity formed on adding to the filtrate lime-water. It 
was not completely cleared by acetic acid. 
Negative results followed tests with alcoholic methyl-violet 
