STUDY OF YUCCA ANGUSTIFOLIA 151 
fied as saponin, separated from it. The alcoholic extract was 
evaporated, dried and weighed, and the ash of the residue 
was estimated. 
TOTAL SOLIDS. 
Alcoholic residue dried at ioo° C 
‘ “ “ iio° C 
“ “ ash. 
The alcoholic residue was treated with cold distilled water. 
The solution was slightly colored, and faintly acid in reac¬ 
tion. The absence of gallic acid, tannin, and alkaloids was 
determined by negative results with iron salts, gelatine, and 
alum solution, gold chloride, and potassio-mercuric solutions. 
Acetate of lead caused no precipitation. Fehling’s solution 
detected a trace of glucose. 
An imperfect emulsion formed on adding water to the alco¬ 
holic residue. Upon standing, the resin settled; the liquid 
was filtered several times, and the greater part of the resin 
collected. It was an opaque reddish-yellow-colored substance. 
It had the same melting-point (79 0 C.), solubilities, and phys¬ 
ical appearance as the resin of ether extract (4). The resin 
was examined by Hirschsohn’s scheme. It differed in charac¬ 
ter from the many resins described by that author, and it 
is proposed to name it pyrophaeal. 1 
Pyrophaeal was slightly soluble in ether, and 95 per cent, 
alcohol; soluble in benzole, chloroform, and acetic ether; in¬ 
completely soluble in cold absolute alcohol, amyl alcohol, 
carbon di-sulphide, and oil of turpentine. It was saponified 
with aqueous and alcoholic soda. The ethereal resin solution 
was cloudy. The alcoholic resin solution gave a precipitate 
with lead acetate which did not disappear on boiling; ferric 
chloride and aqueous ammonia formed turbid mixtures with 
it. The chloroform resin solution was not affected by bromine 
solution. The petroleum-ether-resin solution turned to a tur¬ 
bid mixture on adding iodine solution. Alcohol containing 
hydrochloric acid was not colored by the resin. Sulphuric 
acid and alcohol gave a turbid brown mixture with it, and 
1 “Pyrophaeal,” Science , September n, 1885. 
.4.30 per cent. 
.4.30 “ 
.0.05 “ 
