Erratic blocks, over the northern parts of England, _Prof. Phillips_, xxxi, 360. ---- ----, ibid, _R. I. Murchison_, xxxi, 375. ---- ---- and glaciers in Switzerland, _Agassiz_, xli, 59, 190. ---- ---- of the North of Germany, xxviii, 389. ---- ----, large, in Invernesshire, vi, 158. ---- ---- and diluvial scratches, in the U. States, xli, 174. ---- ---- in New England, their positions attributed to a retiring ocean, ix, 28. ---- ---- in Rhode Island, _C. T. Jackson_, xl, 184. ---- ---- in Maine, _C. T. Jackson_, xxxvi, 152. ---- ---- in the Connecticut valley, vi, 85. ---- ---- in western New York, xxxvi, 39. ---- ---- in New York, about the sources of the Hudson and to the southward, xxxiii, 304, 315. ---- ---- on Long Island, xxxvi, 20. ---- ---- of Labrador feldspar, near Pompton, New Jersey, v, 241. ---- ---- of Ohio, _D._ and _I. A. Lapham_, xxii, 300. ---- ----, in the valley of the Muskingum, xxix, 11. ---- ---- in Illinois, xxxiv, 141. ---- ---- in Indiana, _J. T. Plummer_, xliv, 296^f, 303. ---- ---- of gneiss and granite on the Côteau des Prairies, _G. Catlin_, xxxviii, 142. ---- ---- of the Canadian lakes and valley of the St. Lawrence, _C. Lyell_, xlvi, 314. ---- ---- the origin of, remarks on, _P. Dobson_, x, 217. ---- ---- _Murchison's_ citation of _Dobson's_ views on, xliii, 200. ---- ---- transported by ice, in the polar current, _W. C. Redfield_, xxxii, 351. ---- ---- on the supposed transportation of, _J. E. DeKay_, xiii, 348. ---- ---- buoyancy of, at great depths, xxviii, 111. ---- ---- gravel, &c., remarks on, _Sedgwick_, xxxiii, 287. ---- ---- theory of, _B. Struder_, xxxvi, 325. ---- glacial theory of _Agassiz_, xlii, 352.^f ---- see farther under _Drift_ and _Scratches_. Erythronium, supposed new metal, xx, 386. Esophagotomy, iv, 383. _Espy, J. P._, views on storms, xxxix, 120; xl, 327. ----, ---- ----, notice of, by _A. D. Bache_, xxxv, 280. ----, on the causes of the daily fluctuations of the barometer, xli, 42. ----, meteorological enterprise of, xliv, 212. Esquimaux Indians, remarks on, xvi, 145. Essential oils, reaction of, with sulphurous acid, _R. Hare_, xxxi, 281. Essex county, (N. Y.) mountains of, and the sources of the Hudson, _W. C. Redfield_, xxxiii, 301.^f Etching glass with fluor spar, vi, 354.^f Etna, ascent of, _S. L. Johnson_, xxvi, 1. ----, crater of, xxvi, 7. ----, earthquakes in 1823, ix, 216. ----, observations on, _E. de Beaumont_, xxxi, 168. ----, luminous flames at, xxxi, 169. ----, geological structure of, _F. Ferrara_, viii, 201.