488 THE POPULAR SCIENCE MONTHLY. 



thetic and analytic, and we owe to him elaborate studies of the chem- 

 istry 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 compre- 

 hensive 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 apjjlications 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. 8ee also his essay on " The Coal and Iron of Southern 

 Ohio" (Salem, 1874), A large part of the reports of the Canada Sur- 

 vey during twenty-five years was contributed by him, and also the lat- 

 ter 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 Ap- 

 palachians 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, dolo- 

 mites, gypsum, petroleum, and ore-deposits, with many notes and addi- 

 tions, and with selections from his papers on the philosophy of chem- 

 istry 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 Ad- 

 vancement of Science in 1870. He is a member of the National Acad- 

 emy 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. lie is a member of the Imperial Leopoldo-Caro- 

 linian 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. 



