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First edition of the first study of heat diffusion, now considered a cornerstone work in mathematical physics. Fourier showed that heat diffusion is subject to simple physical constants, which can be discerned through observation and expressed mathematically. This definitive version was an expansion of his paper on the conduction of heat, for which the French Academy of Sciences awarded him a prize in 1802. It made significant advances in the direction of boundary-value problems, extending rational mechanics to fields outside those defined in Newton's Principia. Fine, uncut copy with its temporary wrappers preserved and perhaps bound for the bookseller Henry George Bohn, compiler and publisher of Bohn's Scientific Library (71 volumes, 1847-89); it acquired an important association when it entered the library of Charles Cellérier, author of Note sur l'impossibilité de faire passer de la chaleur d'un corps plus froid dans un corps plus chaud sous forme rayonnante (Geneva 1891).