206 ON AQUA REGIA AND HYPOSULPHURIC ACID. 
siderably diminished, and at 482° F. it ceased entirely to be 
disengaged. Together with the oxygen, red nitric acid 
was distilled over, amounting almost to one-third of the sul- 
phuric acid added. 
The moment the temperature of the acid was found to be 
620° F., the neck of the retort was introduced into a vessel 
in which carbonic acid was continually disengaged, and the 
flame of the spirit lamp was gradually diminished. The 
acid, which, when boiling, was of an intense yellow, after 
cooling became completely colourless. 
15. Cooled down to the common temperature, the acid 
formed no chlorine with hydrochloric acid. 
Being treated with water, as in experiments 12 and 13, 
on an addition of hydrochloric acid, the acid gave chlorine. 
Another portion of the acid being mixed with alcohol ? 
the air being excluded, formed nitric ether. 
Copper dissolved in it. with a violet colour, and a disen- 
gagement of binoxide of nitrogen. 
After having adapted to the tubulure of the retort, a 
funnel provided with a stop-cock, through this were first 
introduced carbonic acid, and then 26 grammes of acid. 
Heat was afterwards applied, and when the water was boil- 
ing the cock was opened. The temperature of the water 
was considerably raised by the addition of the acid. 
At the same time, red vapours were disengaged, and re- 
ceived into water with carbonate of lime suspended in it ; 
heat was then applied until the temperature of the acid 
arrived at the boiling point of sulphuric acid. The liquid 
separated from the carbonate of lime was evaporated to 
dryness, and the residue was exhausted with alcohol. The 
alcoholic liquid, on being evaporated, in its turn, gave a 
residue, which, on calculation, left 0.21 grammes of lime. 
These facts being established, we mean to apply them 
to aqua regia and hyposulphuric acid, in order more fully 
to ascertain the nature of these liquids. 
