XXVI. On the effects of heat on certain haloid compounds of silver, mercury, lead, and copper

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Abstract
The researches described in the following pages, which were commenced in 1874, were suggested by observations made by Professor Clerk Maxwell and M. Fizeau. The former (‘Theory of Heat,’ p. 8), in discussing the effects of heat upon matter, writes: “The body generally expands (the only exception among solid bodies, as far as I am aware, is iodide of silver, which has been found to contract as the temperature rises).” The latter (‘Nouvelles observations relatives à l’Iodure d’Argent’), remarks: “Ce corps, en effet, paraît offrir l’exemple d’une inversion complète des phénomènes ordinaires de la dilatation par la chaleur, car son volume diminue trèscertainement pendant l’echauffement, et augmente pendant le refroidissement.” It was thought that results of interest might be obtained as to the molecular constitution of this anomalous body, by examining the effects of heat upon it at higher temperatures than those employed by Fizeau (which in no case exceeded 100° C.); also by forming compounds, or alloys, with it, and other bodies, and determining the effect of its presence upon the coefficients of expansion and the physical structure of such bodies.

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