Oil of cajeput, xxviii, 384. ---- of the Chené, ii, 264. ---- of cinnamon, xxviii, 385, ---- of the Croton tiglium, xiv, 369. ---- from grape seed, ii, 348. ---- of Indian corn, xliii, 403. ----, inflammable, xii, 388. ---- of juniper, xxviii, 385. ----, olive, impurities in, xix, 76. ----, ----, purification of, for chronometers, xx, 166. ---- from the spirit of wine of potatoes, _J. Dumas_, xxviii, 386. ----, essential, of potatoes, xxxii, 382. ---- of Ricinus communis, impurities in, xix, 77. ---- of roses, on the preparation and analysis of, _R. Blanchet_, xxviii, 383. ---- of turpentine, see _Turpentine_. ---- of sweet almonds, impurities in, xix, 76. ---- of the tutui or candlenut tree of the Sandwich Islands, xxxiv, 209. ---- of wine, destructive distillation of, xxxvi, 76. ---- from white fish, xxxv, 391. ----, essential, adulteration of, with alcohol, xix, 77; xlvii, 197. ----, ----, action of, with sulphurous acid, _R. Hare_, xxxi, 281. ----, watchmaker's, best, ix, 202. Oil-casks, rendered impermeable by glauber salt, xxx, 173. Oilstone, of Ohio, xvi, 374. ----, of Georgia, xvi, 185. ----, of Lake Memphremagog, v, 41, 406. ----, of North Carolina, v, 262; xiv, 238. _Olbers, H. W. M._, obituary of, xxxix, 387. Old man of the Mountain, xiv, 64.^f Olea Americana, northern limit of, _H. B. Croom_, xxvi, 315. Oligostachyum, iv, 58. _Oliver, B. L._, on prussic acid, iii, 182. ----, letter to, on Otaheite, _J. A. Maerenhaut_, xxix, 283. ----, on the use of iodine in gout, xvi, 176. Olivine from near Naples, _L. P. Walmstedt_ on, ix, 378. ---- and chrysolite, comparative analyses of, xiii, 184.