170 
ON THE EXTRACT OF HEMLOCK. 
It is unnecessary t» go into detail in relation to the processes 
used to arrive at the above results ; but it may be added, that this 
bark subjected to treatment with aqueous or alcoholic menstrua, 
manifests properties widely differing from those of the officinal Cin- 
chonas under similar circumstances. 
The above-mentioned extractive matter resembled very much in 
its tenacious property, as well as in taste, the extract of Gentian, 
while several different processes were unsuccessful in enabling me 
to separate from it any crystallizable principle. 
A specimen of this bark was shown by me to Professor Guibourt 
at the Ecole de Pharmacie in Paris, which he pronounced at once 
to be the variety from which the above-mentioned alkaloid was 
said to have been obtained, but that its discovery by Folchi and 
Peretti was a betise. Professor G. seemed to be of the opinion 
that this bark contained either quinia or cinchonia, though I did 
not understand that he had investigated it himself. Since that time 
I have re-examined a portion of this same bark at the laboratory 
in Giessen, and am quite confident that it contains no alkaline 
principle whatever, and its 'tonic properties, if it possesses any, 
must be traced to other sources, than to the presence of the princi- 
ples which have hitherto been attributed to it. — N. Y. Reg. of 
Med. and Phar. Feb. 15, 1850. 
ON EXTRACT OF HEMLOCK. 
By Mr. W. Archer. 
In the following experiments upon the expressed juice and dried 
leaves of the hemlock plant (Conium maculatum) made in the 
laboratory of the Pharmaceutical Society, the results sought 
were, 
1st. The means by which the expressed juice of the plant could 
be inspissated, so as to form a mass most nearly resembling, in 
chemical and medicinal properties, the freshly expressed juice. 
2nd. Whether, by the separation of some of the constituents of 
the recently expressed juice, a more efficient extract than that 
usually met with could be obtained. 
