ON GALBANUM. 
29 
little greater, the effeet would have heen the same as the al- 
kaline solutions ; hut should it be doubted that the oils con- 
stitute the active principle of the resins, it may be proved by 
introducing a few drops in a capsule, in which manner it 
may be swallowed without inconvenience. 
To procure scammony at a cheaper rate is the object of 
my publishing the foregoing; and I think nothing more 
would be necessary than to express the milky juice from 
the fresh roots of jalap, and allow it to evaporate spontane- 
ously, which, I should imagine, would procure a larger quan- 
tity and equally pure as the scammony obtained by making 
an incision in the root, and allowing the juice to exude ; 
however, this cannot be tried in this country, but I think it 
would be worth the attention of some individual who may 
have it in his power to try what I have now suggested. 
The Chemist. 
ART, VII. — ON GALBANUM. 
By M. Ludwig. 
There is some difference of opinion concerning the 
plants which produce galbanum, arising from the supposition 
that it comes from only one plant, notwithstanding that 
commerce furnishes two entirely different sorts. 
The most common opinion relative to the origin of galba- 
num attributes it to the Bubor Gummiferum, L., Ferula 
Galbanifera, Com. Hort, indigenous to the south of Af- 
rica, and to the Bubor Galbanum,h. } Ferula Galbanifera, 
Herm., a rather different species, frequently found in the 
botanical gardens of Europe. 
Mr. Ludwig does not think that these are the maternal 
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