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SELECTED ARTICLES. 
the resin which I supposed to have been acted upon by the 
chlorine, by means of weak ammonia, I obtained a green pre- 
cipitate, which was immediately re-dissolved by the liquid 
and communicated to it a rich emerald green colour. If the 
solution of quinia, thus treated with chlorine be somewhat 
concentrated, the precipitate is of a dull tint; sometimes the 
quinia becomes agglomerated and floats on the surface in small 
masses, resembling green wax, and which like that substance 
are very ductile. 
"The emerald green liquid contains an excess of ammonia; 
it can be rendered neutral, by adding with great precaution, 
very small portions of acid, the fluid then becomes of a sky 
blue colour. If too much be added at once, the solution be- 
comes of a violet or even a fire red hue." This sometimes 
lasts, says the author, for several days, but fades, and a floccu- 
lent precipitate occurs. 
These alterations are worthy of particular attention, and it 
appears to us, by collecting all the products and subjecting 
them to rigorous elementary analysis, that we may arrive at a 
knowledge of the true arrangement of the atoms of quinia and 
consequently of vegetable alkalies of the same class. 
M. Andre has not studied these alterations of quinia, but 
he has observed that the green, blue or violet tints are not 
produced in the same manner, when ammonia is added before 
the chlorine, &c. He adds that cinchonia, morphia, strychnia 
and brucia and their salts did not undergo these changes, on 
the addition of chlorine, ammonia and an acid. Cinchonia 
afforded a brown colour, morphia a fire red, and the two others 
white precipitates. 
Experience has demonstrated to us the truth of these results. 
We will merely observe that to succeed, the solutions of the 
alkaloids must be very much diluted, and the ammonia must 
be very carefully added, and then the acid, both of them hav- 
ing been previously much diluted. 
With quinia. — The addition of ammonia in chlorine liquid, 
gives an emerald green tinge, which disappears with acids, 
but re-appears when an additional portion of ammonia is added; 
