Occultation of Aldebaran, July, 1830, xix, 170. Ocean, natural history of, v, 128. ----, color of, vi, 198; xxix, 237. ----, ----, cause of, xvii, 170; xxvi, 65.^f ----, depth of, v, 130; xl, 407. ----, ----, not determined from the echo, xxxviii, 160. ----, temperature in different parts v, 129; xxv, 130. ----, ---- and saltness of, at different depths, xxiii, 10. ----, ---- at great depths, xvii, 295. ----, ---- ibid, _Foster's_ observations, xvii, 299. ----, ---- ibid, _Irving's_ observations, xvii, 299. ----, ---- ibid, _Scoresby_ and _Buchan_, xlv, 139, 140. ----, ----, between New York and Rio, 1834, xxix, 237. ----, saltness of, _H. Humphreys_ xlix, 208. ----, ----, remarks on, v, 131. ----, ----, at different depths xxiii, 10. ----, pressure of, at great depths, xiv, 194. ----, deep soundings in, by the French ship Venus, xl, 407. ----, phosphorescence of, v, 133; xvii, 209; xviii, 166, 187; xxxvi, 208. ----, supposed effects of, on the features of western New York, during its elevation, xxxv, 86. ----, see _Sea water_. Oceanic currents, v, 132. ---- ----, of the Atlantic, iv, 390. ---- ----, of the Gulf Stream, v, 133, 353. ---- ----, general remarks on, _W. C. Redfield_, xxv, 130; --circuit currents of the Atlantic and Pacific, 130, 131; cold polar currents flowing beneath the tropical, and carrying icebergs into the Gulf Stream, 131; their influence on climate, 133. ---- ----, tidal, course of, in the Atlantic, _W. C. Redfield_, xxviii, 313. ---- ----, Gulf Stream, relation of, to an opposite current on the North American coast, _W. C. Redfield_, xxxii, 349. ---- ----, Gulf Stream, icebergs carried into, by the deeper polar current, _W. C. Redfield_, xxxii, 351, 352; --lower temperature on shoals and shores due to the submarine current, 353. ---- ----, prevailing, and observations on tides, _W. C. Redfield_, xlv, 293. ---- ----, on ancient polar, _W. C. Redfield_, xliii, 152. ---- ----, effects of polar, _W. C. Redfield_, xlv, 326. ---- ----, of the north Atlantic and the drift ice, with a map, _W. C. Redfield_, xlviii, 373. ---- ----, Gulf Stream, existence of, determined by _B. Franklin_, xlvii, 162. ---- ----, ---- ----, remarks on, _M. F. Maury_ xlvii, 161; --warmth of, 162; course, color, 164; relation of amount of waters to waters of Mississippi, 165; causes of, 165; evidence from bottles thrown overboard, 167; temperature of, 175; cold northern currents, 177; Japan currents, 181. ---- ----, tidal, see farther under _Tides_. Ochres, in Connecticut, v, 36. ----, in Vermont, iii, 58; iv, 43. Odessa, notice of, vi, 386. Odontograph, xxxv, 319. Odors affected by electricity, xv, 394. Odor, like Benzoin, from a man's arm, xxii, 368. ---- of wines due to œnanthic ether, xxxii, 381. Œnanthic ether, xxxii, 381. ---- acid, xxxii, 382.