“It appears to the author, that the only fact established by the experiments of MM. Dulong and Petit is the following:—That the scale of measurement by which we express our knowledge of the state of heat within a body, is not applicable to the expression of the flow of heat within or from the surface of the body. Proceeding upon this supposition, he deduces the thermometric temperature of a body, from the formulæ in v, given by M. Fourier, taking the formulæ as finally obtained, believing them to be accurate expressions of physical conditions. As, however, the letter v cannot, consistently with MM. Dulong and Petit's experiments, denote the thermometric temperature, but some exponential function of it, the author proposes, in order to prevent confusion, to employ the word “thermature” to denote that to which the flow of heat is proportional.