_Conrad, T. A._, notes on American geology, xxxv, 237. ----, on characteristic fossils, xxxv, 237, 246. ----, temperature of different geological epochs, xxxv, 239. ----, cause of the features of the U. States, xxxv, 244. ----, on the tertiary fossils of America, xxiii, 204, 339. ----, description of tertiary shells, in a paper by _J. T. Hodge_, xli, 344.^f ----, on the tertiary of the Atlantic coast, xxviii, 104, 280.^f ----, new fresh water shells of Alabama, Tennessee, &c., xxv, 338.^f ----, on the features of the transition or Silurian system, xxxv, 243. ----, on the condition and character of organic life in the transition epoch, xxxvi, 12. ----, characteristic fossils of the N. York rocks, xxxvi, 14. ----, on the Silurian strata, and the characteristic fossils, xxxviii, 86. ----, subdivision of the Silurian system in N. York, xlii, 229. ----, Calymene senaria, xlii, 230. Conservatory at Boston, destruction of, by fire, xlvi, 214. Continents, mean height above the sea, _Humboldt_, xlix, 397. _Conwell, C. C._, chemical experiments on tobacco, xvii, 369. ----, on the passage of light through small apertures, xx, 350. _Conybeare_ and _Phillips_, outlines of the geology of England and Wales, vii, 203. Cooking apparatus of Lemare, vi, 399. Cooling of the earth, a dynamical cause in geology, _W. W. Mather_, xlix, 288. _Cooley, D._, floral calendar, ii, 254. _Cooper_, report on the fossil bones of Big Bone Lick, xx, 370. _Cooper, T._, on the tests for arsenic, iv, 155. ----, disclaimer of, with regard to a fossil described by _A. Eaton_, xx, 413. ----, on volcanoes and volcanic substances, iv, 205. Cooper's rotative piston, xvi, 313.^f Copaiva balsam, a new preparation of, by _G. W. Carpenter_, xvi, 40. Copal, notice of, xliv, 212. ----, solution of, aided by camphor, xiii, 174. ---- varnish, _Berzelius_, xvii, 175. _Copernicus_, monument to, at Warsaw, iv, 387. Coprolites, in Connecticut valley, _E. Hitchcock_, xlvii, 113, 308.^f ---- of birds, analysis of, _S. L. Dana_, xlviii, 46.