‘SUMARUBER. 
_ Hanbury this isapparently due to quassinm. We have repeated» 
the experiment with a sample of ordinary quassia wood with : 
negative results. The P. quassioides wood when treated with — 
water or alcohol affords solutions which display a very marked. _ 
greenish fluorescence. Regarding the content of quassiin 
| it appears to vary considerably. A. Christensen (Archiv. der . 
. Pharm. (3) XX., 481,) states that he found the amount : 
" to vary greatly, some specimens yielding scarcely amy. ~ 
- Stillé and Maisch give the yield at 0°15 to 0°05 per cent, — 
_ (National Dispensatory.) The authors of the Pharmacographia “3 
at about 0°1 per cent. MM. Adrin and Mordeaux—(Repert. 
der Pharm. X1., 246—50) obtained 0°125 to 0°15 per cent. of 
white crystalline quassiin, Oliveri and Denars (Gazetta Chim. : 
_Ttal, X1X., 1—9) obtained only 0-03 percent. of the pure prin- ~ 
ciple. While Goldschmiedt and Weidel in 1877 failed to isolate 
quassiin, they obtained however a yellow resin, the presence 
of which had been previously noticed in the wood by 
Fliickiger and Hanbury. The amount of erystallizable prin-— 
ciple present in the wood we examined, we are unable. to — 
accurately give ; as a rough approximation we do not consider _ 
that it would amount to more than ‘02 to ‘03 per cent, as an 
_ Outside limit. ae 
Regarding the methods of analysis, extraction of the wood Nes 
by alcohol, and subsequent boiling of the dry alcoholic extract 
_with water, concentrating, and precipitating with tannin, 
"appears to give the best results, as far as a crystalline product 
vaporated to a small bulk. When cold the deep ye 
ution was precipitated with phosphomolybdic acid, 
the precipitate washed with water containing 
ochloric acid. The precipitate was then tre 
