(Paris, Gauthier-Villars), 1876. 4to. No wrappers. In: ""Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences"", Tome 82, No 17. Pp. (927-) 1006. (Entire issue offered). Marey's paper: pp. 975-77
First printing of a founding paper in electrocardiography where Marey recorded the first electrocardiogram, using the mercury capillary electrometer, the electrical activity of an exposed frog's heart.