thetic and analytic, and we owe to him elaborate studies of the chemistry of lime and magnesia, undertaken with reference to the origin of the native combinations of these bases. Mention should also be made of his contributions to a chemical cosmogony and to a comprehensive theory of chemical and dynamical geology, a sketch of which will be found in his essay on "The Chemistry of the Earth," in the "Smithsonian Report" for 1869.
Dr. Hunt's numerous contributions to chemistry and geology in their technical applications relating to soils, fertilizers, peat, building-materials, the manufacture of salt, and the ores and metallurgy of iron and copper, will be found in the publications of the Geological Survey of Canada, and in part in the proceedings of the Institute of Mining Engineers. See also his essay on "The Coal and Iron of Southern Ohio" (Salem, 1874). A large part of the reports of the Canada Survey during twenty-five years was contributed by him, and also the latter half of the large volume entitled "Geology of Canada" (1863).
Among Dr. Hunt's later contributions to geology are his studies of "Granites and Granitic Veinstones;" "The Geognosy of the Appalachians and the Origin of Crystalline Rocks" (1871); and the "History of the Names Cambrian and Silurian in Geology" (1872). His views as to the crystalline, stratified rocks, their genesis, their great antiquity as opposed to the notion of their more recent origin, and his grouping and classification of them, undertaken after many years of research and comparison over a wider field than has been studied by any other American geologist, constitute a new departure in the science. They have attracted much attention, and, despite some attacks, are finding a wide recognition, both in this country and in Europe. The three essays just named, together with some others, on various subjects of chemical geology, including mineral waters, dolomites, gypsum, petroleum, and ore-deposits, with many notes and additions, and with selections from his papers on the philosophy of chemistry and mineralogy, have lately been published in a volume entitled "Chemical and Geological Essays" (Boston, 1875). Of this work a notice appeared in The Popular Science Monthly, vol. vi., p. 372. It is understood that he is now preparing a "Handbook of American Geology." During the past summer he has been engaged in the new Geological Survey of Pennsylvania under Prof. Lesley.
Dr. Hunt was President of the American Association for the Advancement of Science in 1870. He is a member of the National Academy of Science, the American Philosophical Society, and the American Academy of Boston. In 1859 he was elected a Fellow of the Royal Society of London. He is a member of the Imperial Leopoldo-Carolinian Academy of Germany, and of the Geological Societies of France, Belgium, Austria, Ireland, etc. He was a member of the International Juries at the Great Expositions at Paris in 1855 and 1867, and on the latter occasion was made an officer of the Legion of Honor.
