268 A CHEMICAL STUDY OF 



The ethereal residue was treated with acidulated water and tested negatively for 

 alkaloids. 



The ethereal residue insoluble in water was a mixture of two resins (I) and (II). 

 The one (I) was dissolved by absolute alcohol, the other (II) was mostly soluble in 

 ether. The alcoholic residue was crystalline. It was insoUiblc in acetic ether, but 

 was saponified with alcoholic soda. The ether residue was a resin anhydride ; it was 

 insoluble in alcohol, and in alcoholic or aqueous alkalies. 



The amorphous and green-colored ethereal residue was not entirely redissolvcd by 

 cold ether. It was soluble in chloroform, benzole and carbon di-sulphide ; incompletely 

 soluble in cold alcohol, and insoluble in amyl alcohol. It was slightly soluble in 95 per 

 cent, alcohol and in acetic ether. 1 he latter separated the green coloi'ing matter fi'om 

 it. The resinous mass insoluble in acetic ether melted at 80° C. It was not saponi- 

 fied. This resinous mass insoluble in acetic ether is a mixture of the two resins just 

 described (I) and (II). It was noticeable that the resinous mass was not saponified. 

 Resin (I) was saponified. Resin (II) did not saponify, and as this resin exceeded in 

 amount by 0.5 per cent, resin (I), it would show that a certain percentage of resin 

 anh3'dride in a mixture of two resins forbids the saponification of the mixture. 



It was not determined if the crystals dissolved by water and separated by acetic 

 ether were a part of resin (I) or resin (II) or an independent compound. 



Ethereal extract (4) Avas a turbid yellow liquid. On evaporating, a i-eddish-yellow 

 granular solid i-emained. The extract from the aqueous treatment was tested Avith 

 negative results for tannin, gallic acid, glucosides, and alkaloids. The ethereal residue 

 insoluble in water was identified as a i-esin. It was soluble in ether, benzole, chloro- 

 form, and acetic ether; incompletely soluble in cold absolute alcohol, amyl alcohol, 

 cai'bon di-sulphide, and oil of tui-pentine. It was saponified. A resin was extracted 

 by boiling absolute alcohol from the residual powder of the leaves (the yellow base) 

 which was identified as the same resin, and the name of pyrophreal* was proposed 

 for it. 



I. Resins (1) and (2) are identical substances (yuccal). 



II. Ethereal residue (3) is a mixture of two. resins, and a ci-ystalline principle 

 soluble in water. 



III. Resin (4) pyrophteal is identical with a resin found in alcoholic extract (4). 



ALCOHOLIC EXTRACTS. 



Extract (1), Barh of the Hoot. 



The residual powder from the ether extraction was dried, and replaced in the 

 percolator. The maceration was conducted at the boiling temperature of alcohol. 



* Pyroi)liu'!il. Science, September 11, 1885. 



