Indiana, sketch of the geology and mineralogy of, _W. B. Stilson_, i, 131. ----, ibid, cave near Corydon, containing Epsom salts, i, 133. ----, geological report on, by _D. D. Owen_, noticed, xxxiv, 193; xl, 133. ----, suburban geology of Richmond, _J. T. Plummer_, xliv, 281.^f ----, pisolitic rocks, _J. T. Plummer_, xliv, 283.^f ----, phosphate of iron, _J. T. Plummer_, xliv, 287. ----, fossil including fossil fuci, _J. T. Plummer_, xliv, 290.^f ----, ancient wood and stumps of trees, _J. T. Plummer_, xliv, 302. ----, boulders in, _J. T. Plummer_, xliv, 303. ----, magnesia in the water of, _J. T. Plummer_, xliv, 307. ----, soil of, _J. T. Plummer_, xl, 198; xliv, 310. ----, mounds of, _J. T. Plummer_, xliv, 313. Indigo, _J. Dalton's_ mode of testing the value of, ix, 385. ----, analysis of, xviii, 241. ----, mode of assaying, _S. L. Dana_, xlii, 320. ----, on the manufacture of, in the U. States, _W. Partridge_, xviii, 237. Induction, electrical, see _Electrical_. Inertia, remarks on, _Z._, xiv, 50. Infinites, on, _I. Orr_, v, 326. Infusoria, _Turpin_, on siliceous, xxxii, 400. ----, _C. G. Ehrenherg's_ discoveries in relation to fossil and recent, xxxiii, 111; xxxv, 371^f; xxxvii, 116. ----, ----, in volcanic rocks, xlix, 397. ----, ----, in argillaceous formation, at Berlin, xlii, 388. ----, ----, conclusions on, xxxviii, 405; xlvii, 208. ----, _C. G. Ehrenberg_, on American, xliii, 393; xlvi, 297. ----, ----, near Richmond, Virginia, xlvi, 300. ----, ----, Maryland and Virginia, xlviii, 201. ----, ----, near West Point, New York, xlvi, 302; xxxix, 191. ----, _J. W. Bailey_, in peat earth, West Point, xxxv, 118.^f ----, ----, from Oregon, Bermudas, Virginia and Maryland, catalogue of, xlviii, 321.^f ----, ----, Connecticut, New Haven harbor, xlviii, 337.^f ----, ----, S. Carolina, Charleston harbor, xlviii, 338.^f ----, ----, Virginia, xli, 214; xlv, 313; xlvi, 137^f; xlviii, 330.^f ----, ----, Nova Scotia, xlviii, 339. ----, ----, with bones of Mastodon, xlviii, 339. ----, ----, of the family Baccillaria, xli, 284^f; xlii, 88^f; xliii, 321^f;--localities, xliii, 328, 329. ----, _E. Hitchcock_, remarks on the discoveries of, xli, 258. ----, _W. B. Rogers_, stratum of, near Richmond, Virginia, xlv, 313; xlvi, 141. Infusorial vegetable remains in England, _J. E. Bowman_, xl, 174. Injection, venous, improved instrument for, xxiii, 114.^f Ink, antediluvian, _J. T. Plummer_, xliv, 287. ----, black writing, improvement in, _J. Bostoch_, xx, 195. ----, receipt for, xxx, 169. ----, made with chesnut bark, ix, 202. ----, India, substitute for, xxvi, 189. ----, indelible, xxiii, 201. ----, ----, composition of, _Traill_, xxxvi, 209. ----, ----, _H. Braconnot's_, xvii, 172, 371. ----, ----, stain from, discharged by corrosive sublimate, xxvi, 392. ----, sympathetic, xviii, 148. Inking machine, Wood's, xxiii, 103.^f