Condensation of Several Gases into Liquids. 387 
aqueous solution _ cyanogen, occurred. The pressure of 
the vapour of cyanogen appeared to he 3.6 or 3.7 atmos- 
pheres at 45° F abr. It specific gravity was nearly 0.9. 
mmonia,—When dry chloride of silver is put inte 
ammoniacal gas, as dry as it can be made, it absorbs a large 
quantity of it: 100 grains condensing above 1/30 cubical 
inches of the gas: but the compound thus formed is de- 
composed by a temperature of 100° F., or upwards. A 
portion of this compound was sealed up in a bent tube, and 
heated in one leg, whilst the other was cvoled by ice or 
water. The compound thus heated under pressure, fused 
at a comparatively low temperature, and boiled up, giving 
off ammoniacal ges, which condensed at the a end 
into a liquid. 
“Liquid ammonia thus obtained was colourless, trans- 
parent, and very fluid. Its refractive power surpassed | that 
of any other of the fluids described, and that also of water 
itself. When the chloride of silver is allowed to cool. the 
ammonia immediately returns to it, combining with it, 
and producing the original compound. During this action 
a curious combination of effects takes place; as the chlo- 
ride absorbes the ammonia, heat is produced, the tempera- 
ture rising up nearly to 100°; whilst a few inches off, at the 
the evaporation of the fluid When the’ is retained 
at the temperature of 60°, ihe ammonia boils ‘til it. ‘is a 
pated and ae near The Das of the” 
specific gravity was 0.76. 
“ Muriatic Acid. —When ion from pure muriate of 
ammonia and sulphuric acid liquid muriatic acid is ob- 
tained colourless, as Sir Humphry Davy had anticipa- 
ted. Its refractive power is greater than that - nitrous 
oxide, but less than that of waler ; itis nearly. equal to that 
of carbonic acid. The pressure of its vapour at vat the tem- 
perature of 50°, is equal to about 40 atmospheres.” 
“ Chlorine.—The refractive power of fluid chlorine is - 
rather less than that of water,— — The pressure of it its vapour 
at 60° is nea equal to 4 atm rs Ne 
. Mr. say he made many y similar experiments ou 
other gases, re ,, bat free he has not succeeded i in my pe 
