20 
If this substance is thrown into cold fuming nitric 
acid and allowed to stand for two or three days it dis¬ 
solves entirely; but when precipitated from this solution 
by water, and dissolved in alcohol and ether, it behaves 
like the last, going down as a reddish oil. 
A mixture of fuming nitric and sulphuric acids seems 
to act like nitric acid alone. 
Although we have not succeeded in obtaining com¬ 
binations with nitrous acid, which we know to be such, 
yet we do not doubt but that they are formed, from 
the fact that they have been obtained from other sub¬ 
stance which are very similar to this. 
ACTION OF CHLORINE AND BROMINE. 
Chlorine gas in contact with this resin in a melted 
state combines with it. The experiment is best made 
by putting a few grams in a small Liebig’s drying ap¬ 
paratus, the lower part of which runs horizontally. This 
is placed in a water bath, the temperature of which 
must be kept above 46° C. With this bent tube a retort, 
in which chlorine gas is generated, is connected. 
A. higher or lower compound of chlorine is formed, 
in accordance with the length of time that the gas is 
passed over the melted substance; or two or three 
compounds may be formed at the same time. Fumes 
of hydrochloric acid appear at the open end of the tube. 
The action of bromine is of course similar to that 
of chlorine. Hydrobromic acid is given out, and higher 
or lower compounds are formed, as the quantity of 
