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 100 C 4.30 per cent. 



" no C 4-30 



" ash 0.05 



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. V ** 



An imperfect emulsion formed on aSySpg- water to the alco- 

 holic residue. Upon standing, the rej^n /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 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 



* "Pyrophaeal," Science, September n, 1885. 



