_Robert, E._, visit to Iceland, xxxi, 167; xxxii, 196. _Robertson, E._, on aerostation, xiv, 166, 325. ----, gold medal of the Geographical Society awarded to, xliii, 404. _Robinson, S._, catalogue of minerals of, noticed, viii, 200; ix, 396. ----, localities of minerals, viii, 230. ----, notice of minerals, x, 225. ----, cabinet of minerals of, xiii, 199. _Robison, I._, on the rising of the coast of Chili, in 1822, xxx, 110. _Robison, J._, perfection of the art of photography, xxxvii, 183. ----, substitute for barometer, xxxv, 294. _Robiquet_, on a new metallic dye, xxii, 197. _Rochefoucald, Duc de la_, notice of, xiii, 167; xiv, 392. Rochester, town of, ii, 252. Rock crystal, see _Quartz_. Rock, Paint, i, 67. Rock, Putnam's, v, 37. Rocks, _Brongniart's_ seven classes of, xxxix, 149. ----, _K. C. von Leonhard's_ arrangement of, xx, 182. ----, European, classification of, _H. T. De la Beche_, xviii, 26. ----, American, classification and characters of, _L. Vanuxem_, xvi, 254. ----, nomenclature and classes of, _A. Eaton_, xiv, 145^f, 359. ----, of America, equivalency with European, _A. Eaton_, xxxix, 149. ----, volcanic, characters and arrangement of the different kinds of, _G. P. Scrope_, xv, 28. ---- of the Connecticut valley, vii, 25. ----, joints in, a result of elevation, xxxi, 366. ----, supposed motion, without apparent cause, v, 34.^f ----, moving, of Salisbury, remarks on, v, 34^f; ix, 239. ---- moved by ice, _J. Adams_, ix, 136. ---- ----, _J. Wood_, ix, 144. ----, removal of, by the Saxicava, xlii, 326. ----, excavated basins in, about a fall in the Green Mountains, Vt., vi, 252. ----, blasting of, see _Blasting_. Rocket, newly invented, v, 189. Rocking stone, of Durham, N. H., _J. B. Moore_, vi, 243.^f ---- ---- of Hanover, N. H., xxiv, 185.^f ---- ---- of Roxbury, Mass., vii, 59.^f ---- ---- in Savoy, Massachusetts, ix, 27.^f ---- ---- in Rhode Island, x, 9.^f ---- ---- in Warwick, R. Island, vii, 201.^f ---- ---- in Putnam Co., N. Y., v, 252.^f ---- ---- raised by the Indians of America, vii, 157. Rocksalt, see _Salt_. Rockwell, C. H., analysis of kyanite, xlvi, 383. ----, analysis of meteoric iron of Otsego Co., N. Y., xlvi, 402. _Rockwell, S._, on spontaneous combustion, v, 201. Rocky Mountains, geological observations on the northern termination of, xvii, 2. ---- ----, geology and meteorology west of, _A. Eaton_, xxv, 351. ---- ----, ibid, remarks on, _J. Ball_, xxviii, 1. Rod, divining, iii, 102; xi, 201.^f Rodentia, new species of, xxxi, 385. ----, see farther _Zoology_. _Rodman, W. W._, new localities of minerals, xxxv, 179, 180. _Rodriguez, P. J._, on comets, xvi, 94.^f _Roger, T._, on the preservation of insects, xix, 213. _Rogers, G. A._, method of manufacturing pot and pearl ashes, viii, 304.