Currents in water, remarks on the causes of, _A. W. Carson_, xxix, 340.^f ---- ----, a fact relating to, _C. Rumker_, xx, 180. ---- ----, evidences of them over the surface of the earth, xi, 100. ----, oceanic, v, 132. ----, ----, and temperature, xxv, 130. ----, ----, from the north polar regions in the Atlantic, _Wm. C. Redfield_, xxxii, 349; xlviii, 373.^f ----, ----, ibid, ice boulders and pebbles, transported by, xxxii, 351; xlviii, 373.^f ----, ----, ibid, influence of, on the Gulf Stream, _W. C. Redfield_, xlviii, 381. ----, ----, Gulf Stream, its limits and relation to the north polar current, _W. C. Redfield_, xxxii, 349; xlviii, 381. ----, ----, of the Atlantic, iv, 390. ----, ----, ----, _W. C. Redfield_, xlv, 295. ----, ----, ----, causes of, and influence in producing the sedimentary rocks of the United States, _W. W. Mather_, xlix, 1. ----, of the Southern and Pacific oceans, xlv, 299. ----, atmospheric, see _Winds_. _Curtis, M. A._, new and rare plants of N. Carolina, xliv, 80. ----, botanical labors of, xlii, 12. Curves for arches, method of describing, _J. Thomson_, xxiv, 73.^f ----, of conic sections, instruments for drawing, xv, 368.^f ----, of tri-section, _W. Allen_, iv, 343.^f Cuscutineæ, monograph of North American, _G. Engelmann_, xliii, 333^f; xlv, 73.^f _Cutbush, J._, on the formation of cyanogen, vi, 149. ----, on the composition and properties of the Chinese fire, and on the so-called brilliant fires, vii, 118. ----, an improvement in the electrical lamp, ii, 332. ----, on the Greek fire, vi, 302. _Cuvier, G._, essay of, on the theory of the earth, noticed, i, 68. ----, on the freshwater formations of Paris and Rome, vi, 381. ----, memoir of, by _A. De Candolle_, xxiii, 303. ----, statue of, at Montbeliard, xxx, 184. Cuyahoga, falls of, xxxi, 45.^f Cyanhydric acid (or prussic,) _Magendie_ on, ii, 81. ---- ----, memoir on, by _B. L. Oliver_, iii, 182. ---- ----, ----, by _M. Orfila_, xviii, 157. ---- ----, apparatus for the evolution of, _R. Hare_, xxix, 244.^f ---- ----, extraordinary production of, _A. A. Hayes_, xviii, 201. ---- ----, preservation of, xvi, 260. ---- ----, effect of muriatic and sulphuric acids on, xviii, 146. ---- ----, cases in which administered, iii, 187. ---- ----, efficacy in asthma, vi, 366. ---- ----, effects of, on a horse, xii, 385. ---- ----, effects of, on vegetation, x, 190. ---- ----, chlorine an antidote for, xvii, 174; xxi, 157. Cyanic acid, xvi, 258. Cyanide of gold, a new, xlviii, 191. ----, of potassium, xviii, 329. ----, ----, preparation of, _Liebig_, xlvi, 202. Cyanobenzoyle, xxvi, 273. Cyanogen, formation of, _Dr. Cutbush_, vi, 149. ----, perchloride of, xvi, 257. ----, compounds of, _W. H. Ellet_, xviii, 329. ----, sulphuret of, xix, 378. ----, remarks on, xlvii, 192. Cyathocrinites pyriformis, xlviii, 314.^f D.