boullay's filter, etc. 
7 
results of two experiments with the conical funnel, having 
given him real advantages over the cylindrical instruments. 
In advocating the preference of the methode de deplacement 
for the preparation of the resins of jalap and guaiacum, Mr. 
Mouchon says, that with a common glass funnel he procured 
from good jalap, in fine powder, and mixed with li its weight 
of animal black, a product of one-eighth of pure resin, whilst 
ordinary means furnish only one-tenth, and less pure. 
500 parts of jalap thus mixed, treated with 750 parts alcohol 
of 34°, in three divisions, gave, 
1st, 50 parts dry resin. 
2d, 16 " " " 
3d, 1§ " " " 
a a « 
Total, Qlh. 
This resin, says Mr. Mouchon, "precipitated from its alco- 
holic solution by 1000 parts of water, collected upon a filter and 
dried, was perfectly pure; when powdered it was white, but 
previously shaded and of a resinous aspect. In consequence 
of the exclusion of heat in this process, and being deprived of 
extraneous matters by the charcoal, it possesses twice the 
energy of the commercial resin of jalap. Four grains purged 
a vigorous adult." 
What may be remarked as strange, is the fact that while by 
displacement Mr. Mouchon obtained with the funnel one- 
eighth, the use of Robiquet's adapter gave but one-ninth, and 
Boullay's filter only an eleventh. 
From 500 parts of powdered guaiacum, Mr. M. obtained 
61 of resin by the funnel, with Boullay's apparatus 40, and 
Robiquet's, 48. 
This so far is consistent with my own views, and, judging 
from experience, similar results would be likely to happen in 
its application to all substances rich in resin. 
It having been proved that liquids naturally displace each 
other, the last portion of menstruum which saturates a pow- 
der may be displaced by another of a different nature. 
