180 NICOTIANA TABACUM. 
- An elaborate chemical analysis of Tobacco, 
has been published by M. Vauquelin in the 
Annales de Chimie. His results are, that the - 
broad leaved Tobacco furnishes from its juices 
the following constituents. 1. A large quantity 
of animal matter of an  albuminous - nature. 
2. Malate of lime with an excess of acid. 3. Ace- 
tic acid. 4, Nitrate and muriate of potash in 
observable quantities. 5. A red matter soluble 
in alcohol and water, which swells and boils in 
the fire, its nature undetermined. 6. Muriate of 
‘mmonia, 7. A peculiar acrid, volatile, colour- 
less substance, soluble in water and alcohol, and 
which appears different from any thing known 
in the vegetable kingdom. It is this principle 
which gives to prepared Tobaceo its peculiar 
character, and it is perhaps not to be found in any 
other species of plant... The medicinal activity of 
Tobacco evidently resides in this volatile portion, 
for both the extract and decoction of the plant by 
long boiling become nearly inert, while the es? 
sential or the empyreumatic oil is one of -_ most: 
—_ poisons known. ahi ist 
. Among the substances ee ‘stot Mr. Brodie i in 
hit experiments or vegetable poisons, was the 
empyreumatie oil of Tobacco prepared by Mr. 
Brande by distilling the leaves of ‘Tobacco in a 
