LIQUEFACTION, ETC., OF GASEOUS BODIES. 123 
bath (produced by solid carbonic acid combined with ether, 
after the air had been exhausted,) gas in a liquid, and by an 
increased degree of pressure, in a solid state, could be obtained. 
The learned professor illustrated the truth of the principle by 
producing olefiant gas in a liquid state, and observed that he 
had succeeded in obtaining in the same condition phosphoric 
hydrogen, by hydriodic acid, hydrobromic acid, fluoboron and 
fluosilicon; and in a solid form sulphurous acid, sulphuretted 
hydrogen, euchlorine, nitrous oxide, hydriodic acid, and hy- 
drobromic acid. He had made carbonic acid the type of the 
others, but he thought that nitrous oxide would give a power 
of temperature as far below carbonic acid as that was below 
common ice. He saw no reason why the same result might 
not be obtained from oxygen, hydrogen, and nitrogen; and, 
in fact, he had hoped that evening to have shown oxygen in 
a liquefied state, but he had failed in his experiments, not be- 
cause his principle was wrong, but from the porous, and hence 
imperfect, nature of the vessels used. With respect to hy- 
drogen, he had had indications in the course of his experi- 
ments that it would be found to be a metal of a most subtile 
nature* — Lond. Chemist, 
