Part 8

Chlorine, theory of, ii, 362. ----, controversy regarding the nature of, xvii, 230. ----, _Davy's_ views respecting, xvii 230. ----, atomic weight of, xlvii, 188. ----, allotropism of, as connected with the theory of substitution, _J. W. Draper_, xlix, 346.^f ----, an antidote to prussic acid xxi, 157. ----, explosive reaction of, with hydrogen, _R. Hare_, xxix, 243.^f ----, ---- ----, ----, iii, 341. ----, a remedy in phthisis, xviii, 161. ----, remedy against the dangers of inspiration of, xiii, 393. ----, solubility in water, xlvii, 191. ----, relations of, with hydrogen _J. W. Draper_, xlix, 355.^f ----, and chlorides, remarks on, xiv, 382. ---- ----, uses of, _A. Chevallier_, xxiii, 129. ----, new compound of, with phosphorus and sulphur, by _M. Serullas_, xix, 382.

Chlorides, alkaline, a means of disinfection, xi, 197; xiii, 169. ----, efficacy of, xviii, 159. ----, and chlorine, uses of, _A. Chevallier_, xxiii, 129. ----, experiment to determine the nature of, xxi, 368.

Chloride of lime, xv, 391; xvi, 387. ---- ----, or chlorine, test of the strength of, xvii, 170. ---- ----, manufacture of, at Glasgow, _T. Thomson_, xli, 48. ---- ----, manufacture of, _G. W. Carpenter_, xvi, 177. ---- ----, use of, in bleaching, in making paper, xix, 166. ---- ----, estimation of the bleaching power of, xxii, 354. ---- ----, disinfecting powers of, xix, 177. ---- ----, disinfection at the Morgue at Paris, xxi, 149. ---- ----, used in psora, xvi, 395. ---- ----, use of, in the navy, xix, 164. ---- ----, action of, on alcohol, _E. Soubeiran_, xxiii, 134. ---- of silver, discolored, experiments on, xxi, 369. ---- ----, on the change of color of, xx, 193. ---- of soda, _Labarraque's_ method of using, xix, 365. ---- of soda, lime, &c., on the nature of, _L. C. Beck_, xiv, 251. ---- of sulphur, xxiii, 382.

Chlorite, in Connecticut, i, 354; vi, 228; viii, 259; xxxiii, 165. ----, in Massachusetts, i, 113; iv, 42; vi, 228, 248; viii, 52. ----, in New York, ix, 44. ----, in New Jersey, v, 239. ----, in Pennsylvania, iv, 54; viii, 238; x, 222. ----, in Rhode Island, viii, 228, 232. ----, in Vermont, iv, 276; vi, 228. ----, remarks on, xlvii, 342. ----, slate of Connecticut and Vermont, vi, 27. ----, ----, in New Jersey, v, 29.

Chlorobenzoyle, xxvi, 270, 277.

Chlorohydric acid, experiments by _Macaire_ and _de la Rive_ with reference to, xi, 393. ---- ----, mode of preparing pure, from the muriatic acid of commerce, _R. Hare_, xxxix, 371. ---- ----, fumigations with, at Plattsburgh in 1819, viii, 200. ----, see _Hydrochloric_.

Chloro-hydrogen blowpipe, xvii, 211.

Chlorophæite, iv, 245. ----, at Turner's Falls, Mass., x, 393.

Chlorophyl, production of, by yellow light, _D. P. Gardner_, xlvi, 1.^f

Chlorophyllite, _C. T. Jackson_, xli, 161. ----, description and analysis of, xlvi, 377. ----, a decomposed variety of iolite, _C. U. Shepard_, xli, 357.

Chlorovinic and chlorovinous acids, _A. A. Hayes_, xxii, 141.

Cholera, _Mackintosh_ on, xxxiv, 49. ----, miscellaneous notices respecting, xxv, 174.

Cholesterine, action of potash on, _J. L. Smith_, xliv, 60.

Chondrodite, account of, v, 203, (called yellow mineral); v, 245. ----, crystal of, _J. D. Dana_, xlvi, 381.^f ---- in New York, v, 30; viii, 92; ix, 244; xix, 223; xxi, 325.^f ---- in New Jersey, v, 30, 245; vi, 250. ---- in Pennsylvania, viii, 239; xiv, 17.

Christianite (anorthite), xi, 261.^f

Chromate of potash, to test the purity of, _S. Zuber_, xxiv, 372. ---- ----, (bichromate,) manufacture of, at Glasgow, xli, 50.

Chromatype, _R. Hunt_, xlvi, 396.

Chromic iron of Maryland, analysis of, _H. Seybert_, iv, 321. ---- ---- from Cuba, analysis of, _J. C. Booth_, xxxviii, 243. ---- ----, remarks on, xxvii, 18, 20. ---- ---- in Massachusetts, ii, 374. ---- ---- in Delaware, iv, 53. ---- ---- in Maryland, xxiv, 349, 355^f; xxvii, 18, 20.

Chromium, _Vauquelin's_ process for obtaining, xxi, 375. ----, on the combinations of, _A. A. Hayes_, xiv, 136. ---- oxide, crystals of, xxviii, 396. ----, sulphate of oxide, _M. E. Kopp_, xlviii, 189.

Chronometers, remarks on, xxix, 297. ----, _Dent's_ improvements, xliv, 161. ----, errors of, _E. J. Dent_, xlv, 83.^f ----, sea and land rates of, _Parkinson_ and _Frodsham_, xxvi, 121. ----, rate varied by the density of the medium containing, x, 185. ----, purification of olive oil for, xx, 166. ----, new compensation-balance for, _E. J. Dent_, xlv, 83.^f ----, glass balance for, xxxii, 330.^f

Chrysoberyl of Haddam, analysis of, _H. Seybert_, viii, 105. ----, in Connecticut, ii, 142, 240; iv, 52. ----, in New York, iv, 37.

Chrysoprase, viii, 234; xvii, 353.

_Churchill, S._, notice of a double fish, xxvi, 116.^f

Chyometer, mode of determining specific gravities with, xi, 126.^f

Cicada septendecim, or seventeen year locust, habits of, xiii, 224. ---- ----, account, of, _S. P. Hildreth_, xviii, 47.^f ---- ----, remarks on, _D. Thomas_, xxi, 188.

Cinchona, on the different kinds of bark confounded with, _De Candolle_, xvii, 388. ----, bark, experiments on, _G. W. Carpenter_, ix, 363.

Cinchovatine, xlvii, 196.

Cinnabar in Michigan, i, 433; ii, 170; xxxvii, 185.

Cinnamon stone of Ceylon, analysis of, xiv, 204.

Cipher, new diplomatic, iv, 377.

Circulation of the blood, regulation of, _T. J. Aikin_, xxviii, 79. ---- in plants, xix, 393. ---- ----, _E. Emmons_, xxvi, 99.

_Cist, Z._, mines of anthracite about Wilkesbarre, Pa., iv, 1.

_Cist, J._, on the Melolontha or May bug, viii, 269.^f

Cisterns for water, mode of constructing, xxv, 301.

Citric acid from gooseberries, xvi, 385.

Citricic acid, _S. Baup_, xxxiv, 206.

Civilization, connection of, with mental aberration, xxii, 379.

Clam, eatable, of N. Y., facts regarding, x, 287.

_Clark, D. A._, singular appearances of snow and hail, ii, 132.

_Clark, S._, on the infinite divisibility of a finite quantity of matter, ix, 356. ----, notice of, xli, 217.^f

_Clarke, E. M._, magnetic electrical rotating machines by, xxxiii, 213.^f ----, electrepeter by, xxxiii, 224.^f

_Clary, R. E._, parhelia seen at Green Bay, xxviii, 304.^f

Classification, chemical, remarks on, _O. W. Gibbs_, xlix, 384. ----, ----, _R. Hare_, xxvii, 63; xxxii, 260. ----, mineral, remarks on, _J. D. Dana_, xlvi, 374. ---- of clouds, _E. Loomis_, xli, 325.

Clay of Pownal, Vt., xii, 298. ----, pipe, in New Jersey, ii, 198. ----, potter's, in Massachusetts, i, 344. ----, for sculptors, xxiv, 200.

Cleaveland's Mineralogy, review of, i, 35, 308. ---- ----, second edition announced, ii, 375.

Cleavelandite, (Kieselspath,) a variety of albite, vii, 370, 390.

_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.

Coal, analyses of, _W. R. Johnson_, xxxviii, 382; xxxix, 139; xlix, 169. ----, ----, of Maryland, _Ducatel_ and _Alexander_, xxvii, 31. ----, ----, of Virginia, Chesterfield, _B. Silliman_ and _O. P. Hubbard_, xlii, 369. ----, ----, of Pennsylvania, Tioga Co., _W. Meade_, xiii, 32. ----, ----, indicating iodine, _M. Bussy_, xl, 217. ----, passage of anthracite into bituminous, _M. C. Lea_, xl, 370. ----, cannel, xviii, 376; xxix, 39; xxxi, 79. ----, economical uses of anthracite, x, 331; xi, 78. ----, ---- ---- ---- in smelting iron, xxxiii, 266. ----, ---- ---- ---- in blacksmith's shops, _G. Jones_, xviii, 303. ----, ---- ---- ---- when first used in blacksmithing, xviii, 307. ----, in the arts, heating power of, _W. R. Johnson_, xlvii, 126; xlix, 166. ----, ----, consumption of, in steam engines, xxix, 351. ----, ----, comparative value of American, for steam navigation, _W. R. Johnson_, xlix, 310. ----, ----, amount consumed at Pittsburg, xxix, 79. ----, ----, comparative character of European and American anthracites, _W. Meade_, xii, 75. ----, fossils, vegetable, _A. Brongniart_, iv, 266^f; analysis of the works of _Ad. Brongniart_ on, vii, 178. ---- ----, ----, _H. Witham_, xviii, 110.^f ---- ----, ----, in England, iii, 389. ---- ----, ----, at Wilkesbarre, Pa., ix, 165. ---- ----, upright trees, Nova Scotia, _C. Lyell_, xlv, 353. ---- ----, Ohio valley, _S. P. Hildreth_, xxix, 1, 151.^f ---- ----, marine shells, England, xxv, 199. ---- ----, freshwater shells, Lancashire, England, xxxiv, 26. ----, origin of, xii, 87; xviii, 321. ----, ----, anthracite, xxiv, 172. ----, ----, bituminous, xvii, 397. ----, period, probable constitution of the atmosphere during, _H. D. Rogers_, xlvii, 105. ----, peat converted into, xxxiv, 395. ----, specific gravities and combustible qualities of Ohio coals, _S. P. Hildreth_, xxix, 147.

_Coal Mines and Formations, characters and localities of._

Coal in Alabama, bituminous, xxvi, 190. ---- on Arkansas river, iii, 41. ---- in Connecticut, i, 239; iii, 248; v, 44^f; xxxiii, 163. ---- in Cuba, _J. H. Blake_, xlii, 388. ---- in England, remarks on the strata, xxxiii, 79. ---- ----, _Prestwich's_ observations on the alternation of marine and freshwater beds, xxxiii, 80. ---- ----, _Murchison_ on dislocations in beds, xxxiii, 84. ---- ----, _Prof. Phillips_ on the carboniferous limestone of Yorkshire, xxxiii, 84. ---- ----, marine shells in deposits, xxv, 199. ---- ----, mines of Dudley, visit to, xxxvii, 390. ---- in Illinois, _C. U. Shepard_, xxxiv, 142.^f ---- ----, _D. D. Owen_, xlv, 151. ---- ----, Kentucky, _S. P. Hildreth_, xxix, 140. ---- in Maine, formation of, _C. T. Jackson_, xxxvi, 149. ---- in Maryland, _J. T. Ducatel_ and _J. H. Alexander_, xxvii, 29. ---- ----, chemical analysis of, ibid, xxvii, 31. ---- in Massachusetts, _E. Hitchcock_, xxii, 41; xxxvi, 377. ---- ----, anthracite, in Wrentham, xxiii, 405. ---- ----, ----, of Mansfield, _C. T. Jackson_, xxxiv, 395. ---- ----, ----, in mica schist, probable age of, _C. Lyell_, xlvii, 214. ---- at Mt. Lebanon, Syria, beds of, xxviii, 32. ---- in Negropont, Grecian Archipelago, xxxi, 176. ---- in New York, in the Catskills, vi, 95. ---- ----, Washington Co., _A. Eaton_, xvi, 299. ---- ----, connection of, with coal beds of Pennsylvania, xix, 21. ---- in Nova Scotia, bituminous, xv, 149. ---- ----, the coal formation, _C. Lyell_, xlv, 356. ---- ----, upright trees in strata, _C. Lyell_, xlv, 353. ---- in Ohio, i, 227, 239. ---- ----, observations on, _S. P. Hildreth_, xiii, 38. ---- ----, deposits of the Ohio valley, xxix, 1, 123. ---- ----, of the falls of the Cuyahoga, xxxi, 47.^f ---- ----, of Newcastle, xxxi, 63. ---- ----, of Coshocton, xxxi, 69. ---- ----, bituminous, near Waterford and Zanesville, xxv, 220, 229. ---- ----, extent of beds in, xxxiv, 348, 357. ---- ----, Zanesville, vegetable impressions in, _E. Granger_, iii, 5.^f ---- ----, cannel, xviii, 376. ---- ----, ----, in Licking Co., xxxi, 79. ---- ----, ----, in Guernsey Co., xxix, 39. ---- of Panama isthmus, xliii, 207. ---- in Pennsylvania, beds of, remarks on, _S. W. Pomeroy_, xxi, 342. ---- ----, ----, the equivalent of those of Europe, _A. Eaton_, xxiii, 399. ---- ----, ----, in southern, with analyses, _M. C. Lea_, xl, 370. ---- ----, model of the southern field of, _R. C. Taylor_, xli, 80.^f ---- ----, on the general character, limits and relations of the beds, _J. Hall_, xlii, 52. ---- ----, on the anthracite, xi, 91. ---- ----, ----, _J. Pierce_, xii, 55. ---- ----, ----, of the Belmont mines, Penn., xii, 301. ---- ----, ----, mine of Carbondale, xviii, 319. ---- ----, ---- ----, of Mauch Chunk, _B. Silliman_, xix, 12.^f ---- ----, beds of, ibid, notice of, xx, 163. ---- in Pennsylvania; mines of Wyoming valley, _Z. Cist_, iv, 1.^f ---- ----, ----, of Wyoming, on the rocks accompanying, vii, 260. ---- ----, ----, of Wyoming and Lackawanna valleys, account of, _B. Silliman_, xviii, 308.^f ---- ----, on Tioga river, analysis and description of, _W. Meade_, xiii, 32. ---- ----, in the Monongahela valley, _S. P. Hildreth_, xxix, 58.^f ---- ----, Carbon Creek deposit, some account of, _W. R. Johnson_, xxxix, 137. ---- ----, ibid, analysis of coal from, xxxix, 139. ---- ----, bituminous, xii, 69. ---- ----, ----, _S. P. Hildreth_, xxix, 77. ---- ----, Lehigh company, xxiv, 173. ---- in Rhode Island, anthracite, on the uses and characters of, _B. Silliman_, xi, 78. ---- ----, _C. T. Jackson_, xl, 187. ---- in Tennessee, xxix, 141; xxx, 391. ---- in Virginia, beds of, _J. Grammer,_ i, 125. ---- ----, bituminous, remarks on, _J. Pierce_, xi, 54. ---- ----, mines near Richmond, statistical and geological account of, _A. S. Wooldridge_, xliii, 1. ---- ----, bituminous, of Chesterfield Co., analysis of, _B. Silliman_ and _O. P. Hubbard_, xlii, 369. ---- ----, Kenawha valley, xxix, 108^f, 109.^f ---- ----, Wheeling, _S. P. Hildreth_, xxix, 80.^f ---- ----, porous anthracite or natural coke, _W. B. Rogers_, xliii, 175. ---- in eastern Virginia, of the lower oolite epoch, _W. B. Rogers_, xliii, 175. ---- of the Western states, characters, limits, &c. of the beds, _J. Hall_, xlii, 52. ---- mines, explosions in American, xxxvii, 387. ---- ----, accident in the Bovey, in consequence of the compression of the air, xvii, 38. ---- ----, burning of, at New Sauchie, xix, 386. ---- ----, fire damp, at Newcastle, chemical examination of, _E. Turner_, xxxvii, 201.

Coast survey, U. States, xlix, 229.

Coat of mail, found in Vermont, xiii, 199.

_Coates, B. H._, on the Uvularia perfoliata, as a remedy for poisoned wounds, xxxv, 270.

Cobalt, modes of detecting, _Prof. J. F. Dana_, viii, 301. ----, spontaneous combustion of, xv, 188. ---- and nickel, _Döbereiner's_ mode of separating, v, 188. ---- and nickel ores, of Chatham, Ct., analyses of, _A. A. Hayes_, xxi, 195. ----, [iron,] arsenical, of N. H., _J. F. Dana_, viii, 301. ----, oxide of, near Silver Bluff, S. Carolina, _J. L. Smith_, xlvii, 131; xlviii, 103. ---- ores, analyses of two, _Wöhler_, xxxvi, 332. ---- ----, localities of, in Connecticut, vi, 209, 235; xxi, 195. ---- ----, in Maryland, iv, 283. ---- ----, in Missouri, xii, 378. ---- ----, in N. Hampshire, viii, 198, 301.

Coca of Peru, iii, 397.

Coccolite in N. York, v, 269; vii, 57; ix, 40, 250; xix, 224. ---- in Canada, viii, 70.

Coffee, consumption of, in Europe, iv, 392. ----, the Astragalus balticus in Sweden, a substitute for, v, 180. ---- tree, leaves of, used for tea, xlix, 401.

_Coffin, J. H._, secular acceleration of the moon's mean motion, xlvii, 324.^f

Cog-wheels, on the forms of, _E. W. Blake_, vii, 86.^f

Cohesion, experiments with soap bubbles on attraction of, _J. Henry_, xlviii, 216.

Coins, remarks on, and descriptions of some ancient, xxvii, 74. ---- and medals, character and composition of, _J. W. Draper_, xxix, 157.

Coir fibre, used for ropes, xxi, 33.

Coke, natural, of Virginia, _W. B. Rogers_, xliii, 175.

Cold, effects of, ii, 177. ----, artificial, produced by mixed metals, xiii, 171. ----, ----, a freezing mixture for, xii, 195. ----, extraordinary seasons of, _N. Webster_, xxviii, 183. ---- at New Haven in 1766, 1767, xxviii, 183. ---- at Hartford in 1780, xxviii, 186. ----, extreme, at Plattsburgh, N. Y., iii, 366; xi, 195. ---- in Maine, 1817, mercury frozen by, xxxi, 161. ---- on Lake Superior, ix, 395. ---- of the winter of 1825-6, x, 399. ---- of January, 1835, xxviii, 177. ---- winter of 1837, 1838, in England, _J. Lindley_, xxix, 18.

_Colden, Cadwallader_, correspondence with _Gronovius, Linnæus, &c._, xliv, 85.

Collapse of a reservoir, _R. Hare_, xxxiii, 242.^f

_Collins, Z._, herbarium of, xxiii, 398.

_Collinson, P._, letters from, to _C. Colden_, xliv, 112.

Colombia, features of, _R. Wright_, xxxvii, 2. ----, river Orinoco, rise of, xxxvii, 2. ----, climate and seasons of, xxxvii, 2. ----, mists above 12000 feet, xxxvii, 3. ----, llamas and horses of, xxxvii, 14. ----, vegetation and productions of, xxxvii, 15.

Colophane, a tree affording an aromatic oil, ix, 386.

Colophonite, of Willsboro', N. Y., _H. Seybert_, v, 117.

Color of air and deep waters, and some other analogous fugitive colors, _Count Xavier de Maistre_, xxvi, 65.^f ---- of opaline glass, xxvi, 66. ---- of leaves in autumn, _Macaire Prinsep's_ views respecting, xvi, 215. ---- of the Raphael Tapestries, effect of light and air in restoring, xxxvii, 244. ---- of the sea, due in part to iodine and bromine, xvii, 170. ---- of wood of certain trees, change of, xviii, 404. ----, blue, from buck-wheat, xxii, 384. ----, carmine, produced on ivory by red lead on the under side, xxvi, 74. ----, increase of, when objects are seen with the head inverted, _D. Brewster_, xl, 343. ----, inability to distinguish, xl, 54.

Coloring matter for dyeing, experiments on, _M. Persoz_, xxiv, 380. ---- ---- of the Lichen rocella, xviii, 151. ---- materials for confectioners, xxii, 381.

Columbic acid, _A. A. Hayes_, xlvi, 166.

Columbite, investigations on, _Rose_, xlix, 228. ---- from New Hampshire, large crystal of, _C. U. Shepard_, xvii, 357.^f ----, stanniferous, discovered in Massachusetts by _C. U. Shepard_, xvi, 220.^f ----, a large crystal of, from Middlelown, Conn., _J. Johnston_, xxx, 387.^f ----, localities of, in Connecticut, iv, 52; vi, 236; xxx, 387; xxxiii, 162. ----, in Mass., xvi, 220.^f ----, in New Hampshire, xvii, 357. ----, Torrelite of _Thomson_ identical with, _J. D. Dana_, xxxii, 149.^f

Combustion, facts relating to, xxviii, 70. ----, observations on, _S. Morey_, xxv, 146. ---- of chlorine by olefiant gas, x, 365. ---- of coal strata, products of, viii, 382. ---- with spongy platina discovered, vii, 387. ----, spontaneous, iii, 383; v, 201; xxii, 161; xxvii, 178. ----, ----, of various substances described, _J. Mease_, xxxiii, 147. ---- of ashes, xlii, 165.^f

Comet of 1819, ii, 374. ---- of 1822, notice of, ix, 199, 367. ---- of 1823, 1824, observations on, viii, 315. ----, Olbers's elements of, xiii, 189. ----, Biela's, notice of, xxiii, 390. ----, ----, elements of, 1832, xxiv, 346; xxv, 191; xxviii, 398. ----, ----, supposed possibility of collision with Encke's, xxiv, 346. ---- of July, 1832, _J. J. Littrow_, xxiv, 348. ----, discov'd Ap. 8, 1834, xxvi, 402. ----, Halley's, 1835, xxix, 155. ----, ----, _E. Loomis_, xxx, 209. ----, ----, remarkable phenomena of, xxxv, 285. ----, Encke's, remarks on, xxiv, 346; xxxiii, 15; xxxv, 388. ----, ----, notice of, xxxvii, 191. ----, Dec., 1839, Galle's first, notice of, xxxviii, 378; xl, 207. ----, Jan., 1840, Galle's second, notice of, xl, 40, 207. ----, March, 1840, Galle's third, notice of, xl, 207. ----, October, 1840, the third of 1840, Bremicker's, xl, 207. ----, of October, 1842, discovered by _M. Laugier_, xliv, 211. ----, great, of 1843, xliv, 412; xlv, 188^f, 229. ----, great, of 1843, elements of, _S. C. Walker_ and _E. O. Kendall_, xlv, 188.^f ----, second of 1843, xlv, 230. ----, third of 1843, xlvi, 210. ----, De Vico's, xlviii, 219,[F] 402. ----, ----, first seen in the U. States by _H. L. Smith_, xlvii, 419. ----, southern, of December, 1844, observations on, xlviii, 402; xlix, 220. ----, D'Arrest's, Dec. 28, 1844, xlviii, 403. ----, Mauvais's, xlix, 220. ----, second of 1845, xlix, 220. ----, third of 1845, xlix, 220. ----, on the observations of, _P. J. Rodriguez_, xvi, 94.^f ----, nature of, _W. A. Norton_, xlvi, 104. ----, on the tails of, x, 395; xxxiii, 5, 11. ----, ----, _W. Mitchell_, xxxviii, 35; xl, 59. ----, ----, of Halley's, _B. F. Joslin_, xxxi, 142, 324. ----, ----, formation of, _W. A. Norton_, xlvi, 104.^f ----, possible collision of two, _J. J. Littrow_, xxiv, 346. ----, medal for discovery of, by the King of Denmark, xxiii, 391.

_Commun, J. du_, on the causes of fresh water springs, xiv, 174.^f ----, hypothesis on volcanoes and earthquakes, xv, 12.^f ----, ---- ----, objections to, xv, 25. ----, ---- ----, strictures on, xvi, 51.

Compass, mariner's, on the invention of, _A. Humboldt_, xl, 242. ----, microscopic, _J. Locke_, xxiii, 237.^f ----, surveyor's, improvements in, by _T. Kendall_, xix, 337.^f ----, pivots, on the use of native alloy for, xli, 67.

[Footnote F: At this place, erroneously called _Faye's_ comet.]

Complaisánts, on board a vessel in the Mediterranean, xvi, 171.

Compression of water, xiii, 189.

Comptonite, a new species, iv, 28.

_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