Etude sur l'evolution d'un probleme de physique: la propagation thermique dans les solides.

Paris:: J. Vrin, 1927., 1927. 8vo. 182, [2] pp. Index; partially unopened. Original printed wrappers. Very good. To obtain his doctorate (doctorat es lettres) in 1927, Bachelard wrote two theses: the main one, Essai sur la connaissance approchee, under the direction of Abel Rey, and the complementary one, Etude sur l'evolution d'un probleme de physique: la propagation thermique dans les solides, supervised by Leon Brunschvicg.