16S 
SELECTED ARTICLES. 
sulphuric acid opposes the precipitation of the resinoid matter, 
and that this, from being retained in solution, continues to be 
acted on by the chlorine, and undergoes a greater alteration, 
characterized by the green color which is produced. 
Finally, quinia in powder, exposed to the action of pure, 
dry chlorine gas, becomes strongly impregnated with the gas, 
and takes a green color. Treated with water, a small portion 
is dissolved, and the water becomes acid from containing free 
hydrochloric acid. Treated with boiling water, a part only 
is dissolved; a brown matter remaining like that obtained 
from quinia by the action of chlorine and water. 
The resinoid matter obtained under all these circumstances 
is identical. It presents the following characters : a brown 
color, a bitter taste, but less strong than that of quinia; it is 
scarcely soluble in cold water, and a little more in boiling 
water. Acid liquids dissolve it readily by means of heat, 
but the greater part separates on cooling; it is soluble both in 
weak and absolute alcohol. Dissolved in strong alcohol, and 
set aside to evaporate spontaneously, it separates in the form 
of a granular powder. These granules, viewed by a microscope, 
appear to be four-sided prisms. 
The action of Chlorine upon Cinchonia. 
Chlorine acts upon cinchonia with less energy than upon 
quinia. This does not result from the resistance which the 
crystalline state of cinchonia offers, for the sulphate of cin- 
chonia is also less strongly attacked than the sulphate of 
quinia. The color of the solution charged with chlorine, is 
of a less deep red; it does not pass to a green, but the floc- 
culent matter which is formed and separated does not appear 
to differ much from that produced from quinia. Dissolved 
in alcohol, it affords, by spontaneous evaporation, a brick-red 
matter having somewhat of a crystalline aspect. 
The action of Chlorine upon Morphia. 
Morphia suspended in water, and submitted to the action 
of chlorine, became of an orange yellow, and then clear red, 
