Experiments on Charcoal, l$$ 



Under a bell filled with water under a receiver, and if the 

 air be exhaufted till the remainder forms an equilibrium 

 with a column of mercury of about 20 or 25 centimetres at 

 the mean temperature, the carburated fulphur is then feen 

 to aflame the ftate of gas ; it rifes in large bubbles through 

 the water, without Being diflblved in it: and, if the preflure 

 be reltored, the gas is , immediately condenfed, and reappears 

 under a liquid form. 



Sulphurated hydrogen which traverfes water at the fame 

 preffure, diflblves in it; water faturated with fulphurated hy- 

 drogen, at the preflure of the atmofphere parts with but a 

 very fmall quantity of it, when the preflure is reduced to a 

 fourth. The gas then produced by carburated fulphur is not 

 fulphurated hydrogen. 



2d, If carburated fulphur be introduced into a barometric 

 tube, in which the mercury maintains itfelf at 76 centimetres, 

 it immediately falls to 50 centimetres. The temperature 

 being 12*5 * degrees, if the tube be immerfed in a mercurial 

 tub, the whole gas which made the mercury in the baro- 

 meter fall, becomes condenfed, and the tube is filled with 

 mercury. This gas, then, is not fulphurated hydrogen, for 

 without the contact of an abforbent the latter would have re- 

 mained, gafeous. 



This experiment afcertains nearly the elaftic force of car- 

 burated fulphur at the mean temperature. That, indeed, in- 

 troduced into the barometer by making the mercury defcend 

 to 50 centimetres, fupplies, by its elafticity, the place of a 

 column of 26 centimetres, which is the meafure of it. That 

 of ether at the fame temperature is fomewhat greater. 

 . If the preflure of the atmofphere were only 26 centimetres, 

 no carburated fulphur would exift but in the gafeous irate. 



3d, If liquid carburated fulphur be put into a veflel with 

 aeetite of lead over it, and if this veflel be expofed in a com- 

 plete vacuum, the carburated fulphur will be feen to aftume 

 the elaftic (late, and to ■•traverfe the acetite of lead without 

 blackening it, which fulphurated hydrogen would not fail to 

 do. If the carburated fulphur be (tarred with a foJution of 

 lead, it at length becomes turbid, and affumes a brown and 

 not a black colour. 



We tried, but in vain, to. combine fulphur with fulphu- 

 rated hydrogen to obtain hydrogenated fulphur; we, how- 

 ever, made this gas pafs with fulphur in vapours into a warm 

 receiver. There was no very fcnfihle acXion ; the fulphur 

 only retained the odour of the gas, but was no Ids folid. 



• Vte funpofe of Rcrrimur'; thermometer, - 60* Filif.— Edit. 



Bf 



