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Having often revolved in my mind the great degree of cold producible by the well known experiments of evaporation; in which, by the expansion of a few drops of ether into vapour, a thermometer may be sunk much below the freezing point; and recollecting at the same time the great quantity of heat which is necessary to evaporate or convert into steam a few ounces of boiling water; I was led to suspect, that elastic fluids, when they were mechanically expanded, would attract or absorb hear from the bodies in their vicinity; and that, when they were mechanically condensed, the fluid matter of heat would be pressed out of them, and disused among the adjacent bodies.

philosophical transactions of the royal society of london

IV. Frigorific experiments on the mechanical expansion of air, explaining the cause of the great degree of cold on the summits of high mountains, the sudden condensation of aerial Vapour, and of the perpetual mutability of atmospheric Heat. By Erasmus Darwin, M. D. F. R. S. ; communicated by the Right Honorable Charles Greville, F. R. S