From these experiments it appears probable that sulphureous acid, and nitrous oxide, have some affinity for each other. _c._ 11 measures of carbonic acid were mingled with 8 of nitrous oxide; they filled a space nearly equal to 19 measures. On exposing the mixture to caustic potash, the carbonic acid was absorbed, and the nitrous oxide remained pure. Hence it appears that carbonic acid and nitrous oxide do not combine with each other. _d._ Oxygenated muriatic acid, and nitrous oxide, were mingled in a water apparatus: there was a slight appearance of condensation; but this was most probably owing to absorption by the water; on agitation, the oxygenated muriatic acid was absorbed, and the greater part of the nitrous oxide remained unaltered. _e._ Sulphurated hydrogene and nitrous oxide, mingled together, neither expanded or contracted; exposed to solution of potash, the acid[154] only was absorbed. [154] The experiments of Berthollet have clearly proved the perfect acidity of this substance. _f._ 10 measures of nitrous gas were admitted to 12 of nitrous oxide at 59°. They filled a space equal to 22, and after remaining together for an hour, had undergone no change. Solution of muriate of iron absorbed the nitrous gas without affecting the nitrous oxide. _g._ Nitrous oxide was successively mingled with oxygene, atmospheric air, hydrocarbonate, phosphorated hydrogene, hydrogene, and nitrogene, at 57°; it appeared to possess no action on any of them, and was separated by water, the gases remaining unaltered. _h._ As nitrous oxide was soluble in ether, alcohol, and the other inflammable fluids, it was reasonable to suppose that its affinity for those bodies would enable them to unite with it in the aëriform state. At the suggestion of Dr. Beddoes I made the following experiment: To 12 measures of nitrous oxide, at 54°, I introduced a single drop of ether; the gas immediately began to expand, and in four minutes filled a space equal to sixteen measures and a quarter. When an inflamed taper was plunged into the gas thus holding ether in solution, a light blue flame slowly passed through it. A considerable diminution of temperature is most probably produced, from the great expansion of nitrous oxide during its combination with ether. A drop of alcohol was admitted to 14 measures of nitrous oxide. In five minutes, the gas filled a space equal to fifteen and a third; but no farther diminution took place afterwards.