_Conant, M._, a new magnetic instrument, xlix, 301.^f Conchology, see ZOOLOGY, _Mollusca_. Concretious, calcareous, in limestone, in Indiana, _J. T. Plummer_, xliv, 283.^f Condensation of gases, abstract of _Faraday's_ experiments on, vii, 352. ---- of sulphuretted hydrogen, vii, 352. ---- of carbonic acid, vii, 354. ---- of euchlorine, vii, 355. ---- of nitrous oxide, vii, 355. ---- of cyanogen, vii, 356. ---- of ammonia, vii, 357. ---- of muriatic acid, vii, 357. ---- of chlorine, vii, 357. ---- of gases, _J. Torrey's_ experiments on carbonic, sulphurous and chloro-chromic acids, xxxv, 374; xxxvi, 394.^f ---- ----, _J. K. Mitchell_, xxxv, 346.^f ---- ----, _Thilorier_, xxxi, 163, 402, 404. Conduction of water, _W. W. Mather_, xiii, 368.^f ---- ----, as shown by Murray's experiments, _C. Dewey_, xxviii, 151; xxxi, 246. Confectionary, poisonous, xviii, 157. Conglomerate mica slate, in Massachusetts, viii, 244. ----, Potomac marble, xxvi, 221^f; xxvii, 22. Conic sections, new instrument for drawing the curves of, xv, 368.^f ---- ----, _Prof. Benedict_, xxxi, 258.^f ---- ----, problem in, _Prof. Davies_, vi, 280.^f Conite, a new mineral species, ii, 354. Connecticut, on coal in, i, 239; iii, 248; v, 44^f; xxxiii, 163. ----, geology of N. Haven and Litchfield Cos., _B. Silliman_, ii, 201. ----, geology of Salisbury, _C. A. Lee_, viii, 252. ----, geology of; trap and sandstone in junction at Wallingford, _A. B. Chapin_, xxvii, 104.^f ----, ----, trap rocks, _B. Silliman_, xvii, 119. ----, ----, section from Killingly to Haddam, _W. W. Mather_, xxi, 94.^f ----, ----, report on, by _C. U. Shepard_, noticed, xxxiii, 151. ----, ----, survey of, authorized, xxviii, 381. ----, ores of, see _under names of the Metals_. ---- valley, rocks of, vii, 25. ---- ----, water courses and geology of, with account of terraces, ancient lakes, &c., xxii, 205.^f ---- ----, geological account of, _E. Hitchcock_, vi, 1^f, 201; vii, 1.^f ---- ----, vertebral remains in sandstone of, _E. Hitchcock_, xxix, 330. ---- ----, fossil footprints in, _E. Hitchcock_, xxix, 307^f; xxxi, 174; xxxii, 174; xli, 165; xlvii, 113, 292^f, 390; xlviii, 61. ---- ----, ----, ----, _J. Deane_, xlv, 178; xlvi, 73^f; xlvii, 381, 399; xlviii, 158^f; xlix, 79^f, 213.^f ---- ----, ----, ----, _C. Lyell_ on, xlv, 394. ---- ----, ----, ----, _W. C. Redfield_, xxxiii, 201. ---- Reserve, Ohio, notice of, xxxi, 21.