376 Bibliography. 
the gauge. Hence the following results of pressures and temperatures 
are to be considered only as approximations, viz. at 0° Fahr. pressure 
was 2°9 atmospheres; at 30°, 3:97 atmospheres; and at 60°, 5:86 at- 
mospheres. 
Hydrobromic acid, prepared from the perbromide of phosphosits 
condensed into a clear liquid at 100° below 0°, or lower—and has not 
the pressure of one atmosphere at the temperature of the carbonic acid 
bath in air. Its elastic force is less than that of muriatic acid, but it 
obstructs the motion of the mercury in the gauge, so that its results 
could not be relied on. At and below 124°, it is a solid, transparent, 
crystalline body. It melts at 124°, but does not freeze until reduced 
much lower than this. 
Fluosilicon, was liquefied under a pressure of about nine atmospheres, 
at the temperature of 160° below 0°, and was then clear, transparent, col- 
orless and very fluid, like hot ether. It did not solidify. It acted on 
the lubricating fat of the stop-cock and caused some leakage, and 
there was no liquid in the tube at common temperatures; but when 
cooled to 32° some fluid appeared, and a bath of ice and snow caused a 
still more abundant condensation. 
Phosphuretied hydrogen.—This gas was carefully prepared to free 
it from phosphorus, and cooled to 0°, to free it from water, and by 
these means a pure, clear, colorless, transparent and very limpid 
fluid appeared, which could not be solidified by any temperature applied, 
and which, when the pressure was taken off, immediately rose again in the 
form of gas. There seemed, from the mode of its behavior, to be another 
gas present, not so condensable as phosphuretted hydrogen, which may 
perhaps be either another phosphuretted hydrogen or hydrogen itself. 
Fluoboron, like fluosilicon, required the lowest temperature to reduce 
it to the fluid state, when it was a very limpid, colorless, clear fluid, 
showing no signs of solidification, but when at the lowest temperature 
mobile as hot ether. 
The foregoing are, it is believed, new results of the liquefaction and 
solidification of gases. The following have been before made liquid, 
but some additional facts are now stated. 
Muriatic acid did not freeze at the lowest temperature ; the liquid 
dissolves bitumen and softens the resinous cap cement. At —100° its 
pressure is 1-80 atmospheres, at —92° 2°28, at —83° 2:90, at — 53° 5°83, 
at —33° 8:53, at 22° 10°66, and at —5° 13°88, at 28° 23:08, at 32° 
26°20; the result formerly obtained was 40 atmospheres at 50° Fahr. 
Sulphurous acid becomes a crystalline, transparent, colorless solid, 
at 105° Fahr.; when partly frozen the crystals are well formed. This 
solid is heavier than the liquid acid, and sinks freely in it; at 14° Fahr. 
its pressure is one atmosphere, at 32° 1:53, and at 100° 5:16 atmos- 
pheres. 
