TUCCA ANCrUSTI FOLIA. 275 



periinents with resins and saponin, since I had successfully emulsified resins with 

 aqueous antl alcoholic saponin solutions.* 



By hot alcoholic treatment the ?/i<cca yielded a residue of saponin and resin which 

 became emulsified on the addition of water, giving results identical witli those of the 

 resins above described.f 



Extract (4) contained a resin. It was an opaque reddish-yellow colored sub- 

 stance, and it differed, by its reactions, from the many resin classes given in Ilirsch- 

 sohii's scheme. It is proposed to name it pyroph;eal.:|; A resin having the same melt- 

 ing point, solubilities, physical appearance, and chemical reactions, was discovered in 

 the ethereal extract (I). It was identified as the same compound for which the name 

 pyrophiTial is proposed. 



Tarmin, gallic acid, and alkaloids were not detected in extracts (2), (3), and (4). 

 In extract (3) glucose was not found. 



Tlie Solids of the Alcoholic Extracts. 

 I. A red coloring matter (crystalline). 

 II. A new resin (yuccal).§ 



III. A second new resin (pyropha3al).§ 



IV. A mixture of a crystalline resin and a resin anhydride. 

 V. Saponin. § 



VI. Glucose, and saccharose or other rcducil)le compounds. 

 VII. Ash. 



AQUEOUS EXTltACTS. 



Extract (1), 13or1c of the Hoot. 



The residual powder was thoroughly dried from alcohol. It was returned to the 

 percolator, and cold distilled water added until a definite amount had been used. 

 The aqueous extract was dark colored, and of a faintly acid reaction. A certain (piaii- 

 tity of the extract was evaporated, di'ied, and weighed. Fr(jin a known weight of the 

 aqueons residue, the ash was calculated. The incineration was conduced in a covered 

 porcelain crucible of known weight. 



•The same kinds of resins were used in Uieso experiments as in those with whicli I determined tlie solubility of 

 resins in acetic elher. See footnote (2), ethereal extract (2). 



fit was not until a later date following the lime of these experiments that I found a reference to suponin-rcsin 

 emulsion in L'OfBcine ou Repertoire General do Pharmacie Pratique, par Dorvault. Iluilii-me Edition, Paris, 1872, p. 

 81G. Also, refer to examination of the Turra ani/ii»lifoUn, hy H. C. I)c S. .Miliolt, published in the Medical and 

 Surgical Reporter, Philadelphia, September 12, lSH."i, |i:if;e liOI. 



JPyrophtcal, loc. cit. 



§ Science, September 11, 1885, page 210. Abstract of a paper on the chemical Btuiy of Yueea anguitifolia, hy 

 H. C. De 8. Abbott. 



A. P. S. — VOL. XVI.' 2r. 



