YUCCA ANGUSTIFOLIA. 271 



taken place. The craulsificd li(jiiid was agitated witli acetic ether, and this solvent 

 readily separated most of the resin from the aqueous i)ortion. The water extract was 

 then evaporated to di-yness and redissolved in watei'. Gelatine and alum solution did 

 not precipitate the extract, showing absence of tannin ; no coloration w ilh iron salts, 

 absence of gallic acid; negative results followed tests lor alkaloids; the aqueous 

 extract was boiled witli ijotash and no ammonia fumes were formed; addinjr irold 

 chloride, and potassio-mercuric iodide solutions to the extract gave no iireciijitate. A. 

 measured portion of the aqueous extract was acidified with sulphuric acid, and 

 agitated successively w'ith petroleum spirit, benzole, and chloroform. The solvents 

 were evaporated; peti'oleum si)irit removed 0.01 per cent of a resinous substance, 

 imperfectly soluble in cold and boiling aqueous alkalies, dissolved by sulphuric acid 

 with a red coloration; chloroform left a brownish residue which, on weighing, yielded 

 0.4 {)er cent. This residue was moistened with a few drops of concentrated sulphuric 

 acid, and changed to a red-violet color characteristic of saponin. 



A certain portion of the aqueous extract w^as rendered alkaline, and heated over a 

 water bath with Fehling's solution. The i)recipitated co])per was collected on a 

 weighed filter, dried, and incinerated, and the glucose estimated gravi metrically from 

 it. It yielded 1.592 per cent. .Vnolher portion of the aqueous extract was acidified, 

 boiled, and potash added until the solution was alkaline to litmus jxaper, then the 

 li(^uid was mixed with Fehling's solution and heated ovei' a water bath. The per- 

 centage of saccharose or other substances which reduced the copper was calculated by 

 dilference. It amounted to 0.929 per cent. 



The resin separated by acetic ether was an opaque substance, greenish-yellow in 

 coloi-, and insoluble in ether. The resin was dissolved in water and frothed on shak- 

 ing. The emulsion in this ease was not quite so permanent, as a slight resinous sedi- 

 ment settled after a time, possibly due to changes in the resin through oxidation. 



Extract (3), the Green Part of the Leaf. 



The dried residual powder was raacei'ated by the aid of heat with Squibb's 

 stronger alcohol. When wai-m the alcoholic extract was clear, but on cooling the solu- 

 tion became cloudy, and a creamy-white fine i)recipitate settled. The alcoholic extract 

 was neutral in reaction. It was evaporated in a current of carbonic acid, dried, and 

 weighed. A certain part of the residue was incinerated and the ash determined. 



TOTAL SOLIDS. 



Alcoholic retiduc dried at 100° C 3.80 i)cr cent. 



" liooc :i.80 •• 



ash 0.15 



