ON LOBELIA INFLATA. 
107 
beliiia, as the quantity yielded with this acid is greater than 
with the others. The tartrate, gallate, and oxalate, are also 
crystallizable, but owing to the small quantity acted upon, the 
crystals were very imperfect. 
Experiment 13. — Six grains of the Indian tobacco were 
introduced into a small tube retort, to which a receiver was 
adapted, and from the receiver a glass tube, of suitable form 
and dimensions, was so placed as to conduct the gaseous 
matter under a graduated inverted glass, filled with water. 
Heat was then applied to the retort, until all the volatile 
matters had passed over. In the receiver was found two 
grains of a dark brown oleaginous matter, and in the graduated 
glass 2.428 cubic inches of gaseous matter, having an excess- 
ively fetid odour, of which .906 cubic inches was carbonic 
acid, as proved by agitation with lime-water, and calculating 
from the absorption. After the removal of the carbonic acid, 
the residual gaseous matter inflamed on the application of a 
lighted taper, and burned for a few seconds with a bluish 
flame, where in contact with the atmosphere. The oleaginous 
matter as above procured, is insoluble in water, but very so- 
luble in alcohol, ether, and the volatile oils. It is not affected 
by nitric, and hydro-chloric acids, but is converted into a 
soluble substance, by the caustic alkalies. Its specific gravity 
is .70059. Its odour is nauseous and penetrating, extremely 
like that of the oil of tobacco, and communicates to the breath 
an odour very much resembling that of a professed tobacco 
smoker. Its effects on the animal economy, however, are 
not similar to the last mentioned article. The properties of 
the oleaginous matter above mentioned, were ascertained from 
a quantity obtained expressly for the purpose. 
Experiment 14. — Five hundred grains of Indian tobacco 
were incinerated, and twenty-four grains of ashes were ob- 
tained. These were treated with boiling water for five 
minutes, filtered and evaporated to dryness. The dry mass 
weighed two or three grains, was of a light gray colour, effer- 
vesced with acids, and restored reddened litmus paper to blue. 
This substance was saturated with nitric acid, and evaporated 
