354 Abstract of Mr. Faraday’ s Lxperunents on. the 
all.its.characters, was like that,prepared by the former pre- 
wit Sulpburous acid vapour exerts a pressure of about two 
ameepncss at45°F.. Its specific. gravity was nearly.1.42, 
“ Sulphuretted Hydrogen A tube being bent, and sealed at 
the shorter end, strong muriatic acid was poured in through a 
small funnel, soas nearly to. fill the short leg without soilinghie 
long one. A piece of platinum foil was then crumpled up and 
pushed in, and upon that were put fragments of sulphuret of 
iron, until the tabe, was nearly full. hb this way action was 
prevented until the tube was sealed. If itonce commences, it 
is almost impossible to close the tube in-a manner sufficiently 
strong, because of the pressing out of the gas. When closed, 
€ muriatic. acid was made to. run on to the sulphuret of 
iron, and then left for a day or two. .Atthe end of that 
time, much protomuriate of iron had formed, and.on pla- 
cing the clean end of the tube ina mixture of ice and salt, 
warming the other end if necessary, by a little water, sul- 
‘Phuretted hydrogen in the liquid state distilled over. 
‘The liquid sulphuretted. ydrogen was colourless, lim- 
Pith and excessively fluid., It did not mix with the rest of 
the Huid it 
inthe tube, which was. no 
rs Perce | on it, tA? 3 ‘ 
opened, the liquid immediately, rushed. into vapour 3 and 
this being done under water, and. th vapour collected and 
examined, it proved to be sulphuretted hydrogen gas. As 
more adhesive at 0° thanat 45%, -Its refractive power 
peared to be rather greater than that = Rajan be ‘Pocidedly 
surpassed that of sulphurous’ ac’ e pressure of its vav 
pour was nearly equal to seventeen atmospheres at the tem- 
_“ The specific gravity of sulphuretied hydrogen appeared 
ln oder weal & bay “rio chin shea 8 ace ie 
“Carbonic. Acid.—The materials used in the produc: 
carbonate 
