RESIN OF JALAP. 
ART. IX.-r-NEW PROCESS FOR OBTAINING THE RESIN 
OF JALAP IN A STATE OF PURITY AND PERFECTLY 
WHITE. By M. A Nativelle. 
In a thesis presented to the Ecole de Pharmacie, in the 
month of July last, I pointed out a process for extracting 
this resin, deprived of all coloring matter; but as this pro- 
cess has since undergone several modifications, I have 
thought that it was necessary again to describe it, and that 
in a more detailed manner than I then did. M. Planche 
has already paid much attention to the preparation of this 
resin, which he obtained, of a very light color, by removing, 
as is here done by aqueous but cold solutions, the extractive 
matter of the roots. The process which I am about 1o de- 
scribe therefore coincides with the ideas of that distinguished 
pharmaceutist. 
PREPARATION. 
Each root of jalap is cut into two or three pieces, and 
boiling water is poured on, in order to swell the roots, which 
would otherwise be too hard to be at first easily divided. 
Next day, when they have taken up nearly the volume 
which they might have contained in the recent state, they 
are cut into as thin slices as possible ; water is again added, 
and they are boiled in a copper basin for about ten minutes, 
being occasionally stirred: this being done, the whole, 
liquid and roots, is poured into the box of a press ; the deep 
colored liquor flows out, and the residue is submitted to a 
kind of pressure. Two similar decoctions are then made, 
being pressed each time ; this precaution is indispensable 
for removing all the extractive coloring matter contained in 
the spongy tissues of the roots. 
