“ The igneous rocks of the Vosges, and those of the Alps, Corsica, &c., and the subject of metamorphism occupied his attention. He also prepared in 1858 geological and hydrological maps of Paris—with reference to the underground water, similar maps of the departments of the Seine and Seine-et-Marne, and an agronomic map of the Seine-et-Marne (1880) , in which he showed the relation which exists between the physical and chemical characters of the soil and the geological structure. ”