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SELECTED ARTICLES. 
hydrogens, but it is probable that analogous phenomena would 
have occurred with these different compounds. 
I next experimented with the compound acids, commencing 
with the hydrochloric. A vial of the dry sulphuric acid was 
introduced into a bell glass, containing this gas; this caused a 
sensible diminution of its volume. The bell glass was 
soon filled with mercury; I passed an additional quantity of 
gas into it, but the absorption still continued, until the glass 
had been six or seven times refilled. The sulphuric acid 
became liquid, was perfectly limpid, transparent and colour- 
less. 
The same experiment was tried with concentrated sulphu- 
ric acid, but their was no absorption. Having succeeded with 
the hydrochloric, I next tried the hydrobromic and hydroiodic 
with the same results, though with some variation of the pro- 
cess, as I was obliged to employ a caoutchouc bag to collect 
these gases. The compounds obtained were of a red or red 
brown colour. 
Finally, I operated on deutoxide of nitrogen, which was also 
absorbed. Such are the principal results I have obtained with 
the dry sulphuric acid. These researches, although incom- 
plete, show that this body may be useful in certain analyses, 
for which reason I have judged them worthy of publication. 
Journ. de Pharm. 
