_Rogers, W. B._, analyses of shells, xxvi, 36. ----, apparatus for analyzing marl and carbonates, xxvii, 299^f; xlvi, 346.^f ----, on bimalate of lime in sumach, xxvii, 294. ----, self-filling syphon, xxvii, 302.^f ----, chlorine in meteoric iron, xliii, 169. ----, fossil footmarks, xliii, 173. ----, ores of zinc and lead in Virginia, xliii, 169. ----, oxide of tin in Virginia, xliii, 168. ----, on subterranean temperature, xliii, 176. ----, on the dip of strata, xliii, 171. ----, elevation and flexure of strata, theory of, xliv, 360. ----, proofs of diluvial agency, xliii, 181. ----, infusorial stratum, near Richmond, Va., xlv, 313. ----, ---- ----, in Maryland, xlvi, 141. ----, Virginia tertiary formations, xxxviii, 183. ----, coal of eastern Virginia, of the age of the lower oolite, xliii, 175. ----, natural coke, or porous anthracite of eastern Virginia, xliii, 175. ----, connection of thermal springs with anticlinal axes and faults, xliii, 176. ----, structure of the Appalachian chain, xliii, 177; xliv, 359. ----, on chemical equivalents, xlvii, 105. ----, geological Report on Virginia, notice of, xxxii, 192; xxxvii, 380. Roma, Campagna di, malaria of, xxii, 336. ----, manuscripts at, v, 385. ----, clergy and population of, ix, 186. Roman aqueducts, xix, 389. Romanzow's expedition across Behring's Straits, ii, 345. Roofs of pasteboard, xxiv, 381. Roofing with zinc, _A. Caswell_, xxxi, 248. ----, ibid, _L. D. Gale_, xxxii, 315. ----, slate, of Lebanon, N. Y., v, 11. ----, ----, in Vermont, v, 272. Ropes, on the various vegetable materials for, xxi, 27; xxv, 330. ----, material for, from the Rose of Sharon, xxviii, 371. ----, from Manilla hemp, xli, 200.^f ----, strengthened by a solution of glue with oak bark, xxvi, 186. Rosaic acid in urine, xvii, 385. Rose of Sharon, fibres of, xxviii, 371. Roses, preparation of oil of, xxviii, 383. ----, stearoptine of oil of, xxviii, 383. _Rosé, G._, on the identity of Edwardsite and Monazite, xxxv, 249. _Rosé, H._, on the new metals niobium and pelopium, xlviii, 400. ----, examination of columbite, xlix, 228. Rosin, gas lights from, xxviii, 147. ----, bubbles blown in, ii, 179. Rosse's great telescope, xlvi, 208; xlix, 221. Rossie lead mines, xxxvi, 24; xlii, 174. Rot, dry, _G. Gibbs_, ii, 114. ----, ----, P. Rainey, xxxiv, 169. ----, ----, J. T. Plummer, xlii, 197. Rotary motion, instrument for illustrating, (rotascope) _W. R. Johnson_, xxi, 265.^f ----, multiplier, see under _Electricity_. Rotascope, description of, _W. R. Johnson_, xxi, 265.^f Rotation of the planet Venus, xxiv, 204.^f ----, of fluids, xxvii, 84.^f Rotative piston, Cooper's, xvi, 313.^f _Rothe, C. E._, remarks on the gold mines of North Carolina, xiii, 201.^f Rotting of timber in certain situations, xxxii, 380. _Rowles_, evaporation of water under electrical insulation, xlvii, 190.