FALSE AND TRUE ANGUSTURA BARK. 
241 
ART. XL VIII.— EXAMINATION OF FALSE AND TRUE ANGUS- 
TURA BARK. By M. Genest, Jr., of Angers. 
Not finding in authors who have written upon this sub- 
ject, well defined discriminating chemical characters of the 
two kinds of angustura, I have repeated the experiments, 
which I have found detailed in books, and at the same time I 
have undertaken a series of new researches, with the view of 
fixing upon some prominent points of difference. Although I 
may not flatter myself that I have attained the end in view, 
yet all that relates to the discrimination between these two 
barks is of so much interest to pharmaceutists, that I think I 
ought to report the results, which are different from those pre- 
viously stated, and which I suppose peculiar to myself, as well 
as the new reactions exhibited by the experiments made with 
the above intention. 
A drachm of the powder of each kind, was allowed to 
macerate in an ounce and a half of distilled water; the super- 
natent liquid when filtered presented the followingphenomena: 
Chloride of Barium, 
Bichloride of Mercury, 
Tartar Emetic, 
Perchloride of Iron, 
This reagent appeared 
to me to present a 
greater difference than 
the sulphate of the 
same base. 
Sulphuric Acid, 
VOL, vi. — no. in. 
True, 
No precipitate. 
The reaction resembles 
that indicated in the 
books. 
Same observation. 
A very abundant reddish 
brown precipitate. 
It did not render the true 
very cloudy, as it is 
said it ought to do. I 
obtained but a slight 
cloudiness. 
31 
False. 
Much cloudiness; then 
a precipitate, which 
did not entirely dis- 
solve in nitric acid. 
Abundant dull white 
precipitate. 
In place of a white pre- 
cipitate, I obtained but 
a slight cloudiness. 
Dull green. 
