STUDY OF YUCCA ANGUSTlFOLIA 145 



(1) was saponified. Resin (2) 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 anhydride in a mix- 

 ture 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 



(2) or an independent compound. 



Ethereal extract (4) was a turbid yellow liquid. On evapo- 

 rating, a reddish-yellow granular solid remained. The extract 

 from the aqueous treatment was tested with negative results 

 for tannin, gallic acid, glucosides, and alkaloids. The ethe- 

 real residue insoluble in water was identified as a resin. It 

 was soluble in ether, benzole, chloroform, and acetic ether; 

 incompletely soluble in cold absolute alcohol, amyl alcohol, 

 carbon di-sulphide, and oil of turpentine. 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 pyrophaeal 1 was 

 proposed for it. 



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



II. Ethereal residue (3) is a mixture of two resins, and a 

 crystalline principle soluble in water. 



III. Resin (4), pyrophaeal, is identical with a resin found 

 in alcoholic extract (4). 



ALCOHOLIC EXTRACTS 



Extract (i), Bark of the Root. 



The residual powder from the ether extraction was dried, 

 and replaced in the percolator. The maceration was con- 

 ducted at the boiling temperature of alcohol. Squibb's stronger 

 alcohol was used. A dark red-colored liquid was extracted. 

 It was neutral in reaction with litmus. The alcoholic extract 

 was evaporated in a current of carbonic acid. The residue 

 was non-crystalline and of a red color. A definite volume of 

 the alcoholic extract was evaporated, dried until the weight 



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



