Practical Tourist, review of, xxiii, 213.
Prairies, origin of, _R. W. Wells_, i, 331. ----, ---- and extension of, _R. Nutt_, xxiii, 40. ---- of the West, _C. Atwater_, i, 116. ---- and barrens of the West, _A. Bourne_, ii, 30. ---- of Alabama, _W. W. McGuire_, xxiv, 187; xxvi, 93. ---- formation of Opelousas an Attakapas, _W. M. Carpenter_, xxxv, 344. ----, observations on, _G. Jones_, xxxiii, 226;--dry prairies, 226; comparison with Holland, 228. ---- of Ohio, xxxiii, 230. ---- of Texas, _J. L. Riddell_, xxxvii, 212. ----, Hog-wallow, of Texas, notice of, xxxix, 211.
Prase in Massachusetts, i, 344. ---- in Rhode Island, viii, 226, 230. ---- in Pennsylvania, viii, 238.
Precession of the equinoxes, remarks on, vii, 323^f; viii, 132, 139.^f ---- ----, constant of, _O. Struve_, xlvii, 91.
Precipitate, purple, of silver and gold, xxii, 198.
Prehnite, _L. P. Walmstedt_ on, ix, 378. ----, datholite, &c. at Kewenaw Point, Lake Superior, _C. T. Jackson_, xlix, 87. ----, in Connecticut, i, 50, 135; ii, 232; vi, 223. ----, in Massachusetts, i, 114; iii, 364. ----, in New Jersey, ii, 183, 191, 195, 197; v, 239; xl, 69; xliv, 58. ----, in Pennsylvania, x, 220.
Premiums by the French Academy of Sciences, for 1827, xiv, 380, 389. ---- ---- ----, for 1831, xxii, 194. ---- offered by the Society for the Encouragement of National Industry, France, 1821, 1822, iv, 192. ---- ---- ----, for 1832-34, xxii, 359. ----, for Mechanical Arts, iv, 192. ----, for Chemical Arts, iv, 192. ----, for fabrication of Russian leather, iv, 193. ----, for Economical Arts, iv, 193. ----, for useful inventions in agriculture, xviii, 382. ----, for chemical and medical discoveries, xxii, 194. ----, scientific, xxiv, 210. ----, see farther under _Medals_ and _Prizes_.
Preservation of objects in Natural History, iv, 198. ---- of specimens of animals, directions for, xii, 271; xix, 52. ---- ---- ibid, with arsenical soap, xix, 53. ---- of zoological collections from insects, _T. S. Trail_, xv, 167. ---- of animal and vegetable substances from insects, _J. Macartney_, xxxi, 367. ---- of specimens, new mode of, _J. L. Riddell_, xxxv, 338. ---- of eggs, Scotch method, xxvi, 188. ---- ---- for cabinets, xxi, 161. ---- of insects, _T. Roger_, xix, 213. ---- ----, xix, 56; xxi, 162. ----, of freshwater shells, xlii, 391. ---- of Echini with the spines, xxix, 353. ---- of skins, xxvi, 188. ---- of fish skins for museums, xxxvi, 196. ---- of anatomical preparations, vi, 384. ---- of skeletons, xix, 57. ---- of animal bodies, new mode of, by petrifaction, _G. Segato_, xxix, 359. ---- of animal preparations, by Gannal's new process, xl, 194. ---- of animal substances, salt for, xxx, 183. ---- of crystalline lenses, xxvi, 216. ---- of dead bodies, i, 307. ---- of meats, &c. by Appert's process, xiii, 163. ---- of fruits without sugar, method of, xv, 381. ---- of substances by alkalies, xxiii, 383. ---- of cordage, &c. from moisture, xxiii, 199. ---- of firemen against fire and flame, xviii, 177; xx, 96.^f ---- of grain from mice, vii, 378. ---- of timber by pyrolignite of iron, _Boucherie_, xl, 213. ---- of the Royal George, xl, 213. ---- from rust, a mode of, by means of caoutchouc, vi, 398. ---- of iron from rust, xix, 203; xxi, 150; xxii, 382; xxiii, 199, 383.