ON THE MANUFACTURE OF SULPHURIC ACID. 289 
the morphine undergoes must be more considerable, since 
it can no longer be separated from the compound. More- 
over, the circumstance that a portion of the sulphuric acid 
is precipitated by chloride of barium, while in the above 
ammonia salts none of it is thrown down, cannot be brought 
into perfect union with the view above mentioned ;. it might 
however be explained by a decomposition being perhaps 
effected by the acid employed to dissolve it. — Chem. Gaz, 
from Ann, der Chem. und Pharm. 
ART. LXXX. — OBSERVATIONS ON THE THEORY OF M. P-ELI- 
GOT AND M. BAUDRIMONT RESPECTING THE MANUFAC- 
TURE OF SULPHURIC ACID. 
By Dr. Kcene. 
In the 'Comptes Rendus,' vol. xix. No. 9, is a treatise by 
M. Peligot, the object of which is to prove, — 1st, that in 
the manufacture of sulphuric acid, the sulphurous acid acts 
incessantly and exclusively on the nitric acid, with forma- 
tion of sulphuric acid and hyponitric acid ; 2d, that the 
formation of sulphuric acid is quite independent of the pre- 
sence of the crystals in the lead-chambers. 
This investigation has given rise to a dispute as to priori- 
ty between the above chemist and M. Baudrimont, who 
likewise supposes that the hydrated nitric acid (azotate 
hydrique) is absolutely requisite for the formation of the 
sulphuric acid. 
Both these chemists therefore agree that the sulphurous 
acid reduces the nitric acid merely to the state of hyponi- 
tric acid. 
26 
