Otaheite, letter on, by _J. A. Maerenhaut_, xxix, 283. ----, contents of _J. A. Maerenhaut's_ work on, xxix, 290. _Otto_, on the separation of zinc from manganese, xlvii, 194. Oval arches, tracing of, _E. Miller_, xxii, 303.^f _Owen, D. D._, on fossil palm trees in Indiana, xlv, 336. ----, on geological coloring and symbols, xlv, 351. ----, on geological paintings and illustrations, xlv, 136. ----, geology of the Western States, xliv, 365; xlv, 151, 163. ----, report on Indiana, notice of, xxxiv, 193; xl, 133. ----, on human footprints in limestone, xliii, 14.^f ----, review of New York Geological Reports, xlvi, 143; xlvii, 354^f; xlviii, 296.^f ----, meteorological notices in Indiana, xxix, 294. _Owen, Richard, Wollaston_ medal, presented to, xxxv, 197. ----, on the fossil bones collected by C. Darwin, xxxv, 196. ----, structure of fossil teeth, xxxv, 307. ----, on the Megatherium, xxxvii, 371. ----, on R. Harlan's notice of new fossil mammalia, xliv, 341. ----, reply of _R. Harlan_ to, xlv, 208. ----, on the Dinornis, and the Connecticut valley fossil footprints, xlv, 185; xlviii, 194. ----, on the bird's nests of New Holland, xlviii, 61. ----, Report on the Fossil Mammalia of Great Britain, xlvii, 186. _Owen, Robert_, establishment at New Harmony, x, 165; xi, 188. ----, Plans of Education, &c., ix, 161, 383. Owhyhee, see _Sandwich Islands_--also under _Geology_ and _Volcanoes_. Oxahverite, xv, 387, [Apophyllite.] Oxalates, experiments on certain, xiii, 188. Oxalate of lime, crystallized in plants, xxi, 372. Oxalic acid, _Gay Lussac_, xxvii, 400. ---- ether, new product from, _Malaguti_, xl, 215. ---- ---- and chlorine, compound of, xl, 215. Oxygen, absorption of, by water, ii, 349. ----, abstraction of, from the atmosphere, xii, 91. ----, specific gravity of, xxxv, 298. ----, delicate test of, in a gaseous mixture, xvi, 397. ----, a means of resuscitating from drowning, xvi, 250. ----, respiration of, i, 95. ----, action of oils upon, xxiii, 190. Oxygenized water, iii, 369. Oxy-hydrogen blowpipe, see under _Blowpipe_. ---- - ---- illumination in light-houses, xxviii, 355. Oxyria reniformis, xlv, 29. Oysters, ancient and modern history of, xxxii, 211. ----, fishery of, xxxii, 245. ----, habits of, xxxii, 244. ----, uses, xxxii, 246. Ozocerite, new mineral species, xxvi, 388. Ozone, the cause of the electro-chemical odor, _C. F. Schönbein_, xli, 44. ----, nature and properties of, _F. de Moleyns_, xiii, 318. ----, notice of, xlix, 195. P. Pachuca silver mines, xxiv, 231. Pacific, Caroline Islands, some account of, xxviii, 115. ----, currents of, xxv, 131; xlv, 299. Packfong, composition of, xv, 396. Paddle fish, Ohio, xii, 201.^f Paddle wheel and screw, propulsion of vessels by, xlii, 336. Padua, v, 177. Pæstum, on the stone of which the temple of, is built, xxxvii, 366.