YUCCA ANGUSTIFOLIA. 265 



substances insoluble in water, and soluble in ether and alcohol was 0.15 per cent. The 

 alcoholic solution was evaporated, and the residue was crystalline in structure. 

 Concentrated sulphuric acid imperfectly dissolved it, and gave a reddish-yellow color 

 i-caction ; acetic ether discolored the solution. The alcoholic residue was insoluble in 

 acetic ether, cold and boiling aqueous alkalies ; soluble in chloroform. It saponified 

 with alcoholic soda. 



The amount of the ethereal reskhie insoluble in water and alcohol was 0.65 per cent. 

 It was not soluble in alcoholic or aqueous soda. This would indicate a resin anh}'- 

 dride. Concentrated sulphuric acid gave no color reaction with it ; and a mixture of 

 sulphuric acid and cane sugar dissolved the residue. 



The ethereal residue on treating with cold ether was not entirely soluble in it. It 

 was soluble in chloroform, benzoic, and carbon di sulphide ; incompletely soluble in cold 

 alcohol, and insoluble in amyl alcohol. The ethereal residite was treated with 95 per 

 cent, alcohol, in which it was slightly soluble. A turbidity foi-med in the alcoholic so- 

 lution on adding lead acetate, ferric chloride, ammonium hydrate, and sulphuric acid ; 

 it did not clear up on warming. Hydrochloric acid made a muddy mixture with the 

 alcoholic solution. The ethereal residue yvas not entirely soluble in acetic ether ; the 

 latter separated coloring matter from it. The ethereal residue, insoluble in acetic ether 

 and freed from coloring matter (chlorophyll), was a resinous substance. It melted at 

 80' C. The resin was boiled with absolute alcohol, and on throwing the alcoholic so- 

 lution into cold water it was precipitated as a white cloud. It was not saponified. 



Extract (4), Yellow Base of Leaf. 

 The residual powder from the petroleum spirit maceration was dried and extracted 

 with stronger ether. The ether extract was a turbid yellow liquid ; slightly acid in reac- 

 tion. On evaporating the ethereal extract Sit the ordinary temperature a reddish-yellow 

 granular solid remained. It melted at 79' C For the determination of total solids 

 extracted, a definite volume of the extract was evaporated, dried, and weighed. 



I. 



TOTAL SOLIDS. 



Ethereal residue dried at 10(P C 1.7 per cent of solids. 



110=C ^7 



0.0 " " loss. 



The ethereal residue was treated successively with distilled water, alcohol, and 



ether. 



II. 



Substances souble in elher and water ^-^ P*"' '^''"'' 



alcohol f' 



" insoluble in water and " '^ 



Total solids ^-^ 



