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‎Recherches sur la chaleur spécifique des corps simples et des corps composés.‎

‎(Paris, Bachelier), 1840. 4to. No wrappers. In: ""Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences"", Tome 10, No 16. Pp. (671-) 670. (Entire issue offered). Regnault's paper: pp. 658-663. A few small inkspots on first page.‎

‎Regnault announced here that he has found experimental evidence for the approximate nature of Dulong & Petit's Law for both elements and compounds.""His first results on the specific heat of solids were presented to the Academy of Sciences on April 3, 1840. One finds there the first experimental demonstration of the approximate law of Dulong and Petit, which had been ypothesized, rather than established, by these physicists. For 24 pure elements, Regnault demonstrated that this law was only partially true mostly because there was no accepted table of atomic weights at that time."" (Laurie Dahlberg)‎