Railways, vibration of, _Denham_, xxx, 382.
Railway iron, remarks on, _D. Mushet_, xxxiv, 15.
Rain, amount of, at different heights in the atmosphere, xxix, 354. ----, ----, in S. W. of Ireland, _T. Knox_, xlvi, 394. ----, ----, in the Ghâts of Western India, xxxviii, 103. ----, mean annual amount of, at Perth, Scotland, xl, 342. ----, excessive at Genoa and elsewhere, _J. D. Forbes_, xl, 326. ---- at Paris, in 1823, ix, 194. ----, register of, at Hudson, Ohio, _E. Loomis_, xli, 328; xlix, 282. ----, ----, at Montreal, 1836-1840, _J. S. McCord_, xli, 331. ---- at Westchester, Penn., amount for several years, _W. Darlington_, vi, 326. ---- ----, register for ten years, xiv, 29. ----, at New Fane, Vt., 1823, '24, _M. Field_, viii, 306. ----, tropical, iv, 375. ----, season of, in Columbia, South America, _R. Wright_, xxxvii, 2. ---- from a clear sky, instances of, xxxvi, 178. ----, _Rowall's_ theory of, xli, 40. ----, remarks on, _W. C. Redfield_, xxxiii, 54. ----, red, i, 309. ----, ----, in Tennessee, _G. Troost_, xli, 403. ----, ----, ----, a hoax, xliv, 216. ---- of mollusca, xxx, 187. ---- of fish, xli, 40. ---- of grain, xli, 40. ---- water, contents of, xv, 181, 185. ----, see farther under _Meteorology_.
Rain-gauge, improved, _G. Chilton_, vii, 326.^f ----, conical, _S. De Witt_, xxii, 321.^f ----, used in New York state, xxv, 267.^f ----, globular, of _Robinson_, xlii, 159. ----, _A. D. Bache_, on the effect of deflected currents of air on the results with, xxxv, 287.
Rain-marks in sandstone, _W. Buckland_, xxxv, 308. ----, at Storeton Hill, _Cunningham_, xxxvii, 371. ---- in the new red sandstone of New Jersey, _W. C. Redfield_, xliii, 172; xliv, 136; xlv, 315. ---- in the rocks of the Connecticut valley, _C. Lyell_, xlv, 394. ---- in the Connecticut valley sandstone, _J. Deane_, xlix, 213. ---- in the Potsdam sandstone, _E. Emmons_, xlv, 316.
Rainbow, different brilliancy of the primary and secondary, xxi, 379. ----, supernumerary, _A. C. Twining_, xxxii, 227. ----, accompanied with five supplementary bows, _D. Brewster_, xl, 344. ----, an acoustic, xxi, 381.
_Rainey, P._, on the dry-rot, xxxiv, 169.
_Rains, G. W._, on the generation of statical electricity by the electrical machine, xlix, 93.^f