_Clemson, T. G._, analysis of a titanic iron ore from near Baltimore, xvii, 42. ----, analysis of American spathic iron and bronzite, xxiv, 170. ----, notice of piperin, xviii, 352. ----, method of making sulphuric acid, xx, 347.^f ----, physical geography, industry, &c. of the Hartz, xix, 105.^f Climate, connection with atmospheric and oceanic currents, _W. C. Redfield_, xxv, 133. ----, liable to change permanently or not, _S. Forry_, xlvii, 226. ----, effect of clearing land on, _S. Forry_, xlvii, 237. ----, effect of, on distribution of plants in the United States, _S. Forry_, xlvi, 221. ----, on a change of, _Bishop Heber_, xx, 130. ---- of the earth, _Lyell's_ views on the changes undergone, xx, 377. ---- antediluvian, _L. C. Beck_, xlv, 144. ---- of the post pleiocene period in the U. States, _H. D. Rogers_, xlvii, 257. ---- ibid, _A. Binney_, xlvii, 259. ---- of North America, _E. Mitchell_, xix, 283. ---- of North America, _Daubeny_ on, xxxv, 288. ---- of U. States, remarks on the amelioration of, by _D. Thomas_, xix, 361. ---- of the U. States, _S. Forry_, xlvii, 18,^f 221. ---- west of Alleganies milder than east, _S. Forry_, xlvii, 230. ---- of Florida, xxxv, 63. ---- of the Kenawha valley, _S. P. Hildreth_, xxix, 89. ---- of Ohio, xi, 224, 231. ---- and productions of Washington Co., Ohio, _S. P. Hildreth_, xii, 206. ---- of Columbia, South America, with general meteorological observations, _R. Wright_, xxxvii, 1. ---- ----, effect on human life, xxxvii, 12. ---- of the south of France, v, 173. ---- of Palestine, xxxi, 183. ----, productions, &c., of Singapore, xliv, 151. ---- of the province of Deccan, Bombay, xxxiii, 275. ----, see farther under _Meteorology_. Clinkstone, remarks on the composition of, xix, 380. Clock, an improved, xiii, 182. ----, affected by the state of the atmosphere, xiv, 375. ----, astronomical, _Prof. Bessel_, xliv, 160. ----, ----, on the stopping of, _W. Howard_, viii, 277. ----, see _Chronometer_. Cloth of amianthus or asbestus, xviii, 401. ----, cotton, printing of, in Manchester, England, xxiii, 220. ----, ----, singeing, in the manufacture of, xxiii, 217. ----, made of glass, xxxix, 386. ----, incombustible, v, 188; viii, 390. ----, woollen, remarks on the manufacture of, xxiii, 218. Clouds, fogs and rain, account of, _W. C. Redfield_, xxxiii, 54. ----, how sustained, _Stevelly_, xxxviii, 105. ----, formation of, _Stevelly_, xxxviii, 105. ----, application of the law of definite proportions to the stratification of, xliv, 172. ----, register of, at Nantucket, Mass., xlix, 406. ----, ----, at Hudson, Ohio, _E. Loomis_, xli, 323; xlix, 280. ----, classification of, _E. Loomis_, xli, 325. Clypeaster, in the blue marls of N. Jersey, xvii, 287.