STUDY OF YUCCA ANGUSTIFOLIA 127 
ally followed. Ten grams of the air-dried powder were used 
for the preliminary examination of soluble substances. For 
every gram of the powder, ten c. c. of the solvents were em¬ 
ployed. An additional quantity of the powder was prepared 
for special purposes. Five grams of the air-dried powder were 
dried, in a hot-air oven, at a temperature between ioo° C. 
and no 0 C., until the weight remained constant, for the esti¬ 
mation of moisture. This powder was incinerated in a cov¬ 
ered porcelain crucible at a dull red heat until the carbon was 
entirely consumed. The per cent, of total ash was determined 
from it. 
QUALITATIVE ASH ANALYSES 
Calcium, magnesium, potassium, sodium, iron, manganese, 
chlorides, phosphates, and sulphates were found in every part 
of the plant. 
Determination of { L M0ISTURE l on the powder. 
j II. TOTAL ASH ( r 
I. 
Per cent. 
II. 
Per cent. 
Color of Ash. 
1. The bark of the root .. 
6.78 
17-38 
reddish 
2. “ wood “ .......... 
11.67 
iS -75 
“ gray 
3. “ green leaf __....._ 
8.11 
5-75 
gray 
4. “ yellow base of leaf ...... 
37 -°° 
10.63 
white 
PETROLEUM SPIRIT EXTRACTS 
Extract (1) Bark oj Root . 
The maceration was conducted in an apparatus similar to 
one described in DragendorfPs “Plant Analysis.” 1 A light 
petroleum spirit was used which boiled between 25 0 C. and 
45° C. The extract was filtered from the powder-residue. It 
was a clear pale yellow-colored liquid, and slightly acid in 
reaction. A drop of the extract on evaporating left a uniform 
1 Page 99, Tollen’s apparatus. 
