The Philosophical magazine; a journal of theoretical, experimental and applied physics . Intelli<:ence atul Miscella?ieous Articles. 397 Fig. 3.—Front view of the meter in anornamental ACTION OF SULPHUROUS ACID ON METALLIC OXIDES. The following are the results of experiments on the action of sul-phurous acid on metallic oxides by M. Vogel. l«t. Red oxide of mercury at first becomes protoxide combinedwith sulphurous and suli)huric acids, and is afterwards completelyreduced to the metallic state by sulphurous acid. •2nd. Pcrnitratc of mercury is slowly reduced by sulphurous acid,but th
The Philosophical magazine; a journal of theoretical, experimental and applied physics . Intelli<:ence atul Miscella?ieous Articles. 397 Fig. 3.—Front view of the meter in anornamental ACTION OF SULPHUROUS ACID ON METALLIC OXIDES. The following are the results of experiments on the action of sul-phurous acid on metallic oxides by M. Vogel. l«t. Red oxide of mercury at first becomes protoxide combinedwith sulphurous and suli)huric acids, and is afterwards completelyreduced to the metallic state by sulphurous acid. •2nd. Pcrnitratc of mercury is slowly reduced by sulphurous acid,but the reduction becomes perfect with the aid of heat; the protoni-trate is reduced in the same manner, but more rapidly. 3rd. Bichloride of mercury is not reduced, under the same cir-cumstances, by sulphurous acid, lower than to protochloride; andwhen the solution of the bichloride is mixed with a sufficient quan-tity of sulphurous acid, it is not decomposed by the caustic alkaliesadded in excess; the mercury remains in solution in tlie alkalineliquor. 4th. Protochloride of mercury is not reduced to the metallic stateby sulphurous acid, but merely to a subchloride of mercury; butsubpcrsul
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