STUDY OF YUCCA ANGUSTIFOLIA 135 



TOTAL SOLIDS. 



Ethereal residue dried at 100 C ................. 3.16 per cent, of solids. 



" no C ................. 3.16 " " " 



~ " " loss. 



The resin was incompletely soluble in 95 per cent, alcohol, 

 absolute alcohol, and amyl alcohol; readily soluble in ether, 

 not appreciably soluble in chloroform, benzole, and carbon di- 

 sulphide. It was dissolved by sulphuric acid to a colorless solu- 

 tion, which, on warming, turned to a yellow color, and gradu- 

 ally darkened to a dull brown color, fading to a pale yellow. 



An attempt was made to separate the white needle-shaped 

 crystals mentioned above. The ethereal residue was agitated 

 with acetic ether. The liquid was filtered from the insoluble 

 matter and evaporated. Traces of a resinous substance were 

 separated. The insoluble matter was treated with boiling 

 ether, filtered hot, and the filtrate concentrated. On cooling, 

 the white needle-shaped crystals reappeared. They were in- 

 soluble in water and in acetic ether. 



A separate portion of the ethereal extract was evaporated, 

 and treated with warm distilled water. The aqueous extract 

 was made up to a definite volume, and a known quantity 

 evaporated, dried, and weighed. The amount of total solids 

 was almost inappreciable by weight. The aqueous extract 

 was not colored by iron salts, and it did not form a precipitate 

 with alum and gelatine solution, lead acetate, potassio-mer- 

 curic iodide, nor gold chloride solutions; showing absence of 

 tannin, gallic acid, and alkaloids. The ethereal extract was 

 directly tested for these compounds, and with negative results. 

 A portion of the aqueous extract was evaporated to dryness, 

 and treated with potassa solution, and the residue dissolved with 

 no coloration. Another portion of the aqueous extract was 

 agitated with acetic ether, and the liquids were separated; on 

 evaporating the acetic ether solution, traces of a residue were 

 obtained which sulphuric acid acted upon. A resinous sub- 

 stance separated from the greenish-colored acid liquid; the 

 former was partially disintegrated by cold water. 



The specific gravity of the resin was 1.091. 



