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SELECTED ARTICLES. 
dissolved, the liquor was neutral and of a yellow color; but 
it soon became acid and of a rose color, then red, following 
the course we have before noticed in treating the hydrochlorate 
of brucia with chlorine; finally, yellow flocculi began to ap- 
pear, and when they ceased to form, the operation was 
stopped. These flocculi collected, and washed, first with 
cold, afterwards with boiling water, contracted, and were 
reduced to a very small volume. The liquid, from which 
they were separated, when saturated by ammonia, gave some 
flocculi, the weight of which was insignificant, and the color 
vinous red. By evaporation, much hydrochlorate of ammonia 
was obtained, of a dirty red color, but it was not possible to 
separate this coloring matter from the hydrochlorate of am- 
monia by which it was impregnated. 
In a third experiment, I stopped the process at the moment 
when the liquid appeared to have attained its maximum of 
coloration. Saturated with ammonia, a flocculent matter was 
separated, which, on being washed and dried, had the appear- 
ance of a resin. This matter was of a clear white, insoluble 
in water, soluble in alcohol, but not crystallizable; its taste 
was bitter; nevertheless it did not contain brucia, for admi- 
nistered to a rabbit in the dose of two decigrammes, it 
produced no effect upon the animal. 
The flocculent matter which had separated spontaneously 
from the solution of brucia, would not crystallize any more 
than that obtained by ammonia, nor would it sublime without 
decomposition; in short, it exhibited no property by which 
it could be considered as a body chemically pure or suscep- 
tible of being purified; I was, therefore, obliged to abandon 
it; it would have only been loss of time to submit the matter 
to an elementary analysis. However, it is evident that the 
chlorine does not combine directly with the brucia, but that 
it acts strongly upon its elements, converting it into a resinous 
matter, by separating a part of hydrogen, with which the 
chlorine combines to form hydrochloric acid. 
