Part 11

_Eaton, A._, alcohol, observations on, xvi, 173. ----, geology of the Highlands, N. York, v, 231. ----, ---- and meteorology west of the Rocky Mts., xxv, 351. ----, ---- along the Erie canal, viii, 358; ix, 355; xiii, 383. ----, ----, coal formations of N. York, xix, 21. ----, ---- of northern states, notice of Index to, i, 69. ----, ----, Cherty limerock, xxxvi, 61. ----, ----, coal, anthracite, Washington Co., N. Y., xvi, 299. ----, ---- of Southampton Lead mine, i, 136. ----, ----, diluvial deposits in N. York and elsewhere, xii, 17. ----, gravel near Troy, v, 22. ----, North American localities, showing equivalency of rocks on opposite sides of the Atlantic, xxxix, 149. ----, cardinal points in stratiographical geology, xxi, 199. ----, geological equivalents, xxi, 132. ----, ----, nomenclature of rocks, xiv, 145^f, 359. ----, ----, Prodromus, xvii, 63. ----, gold rock of the south is talcose slate, xviii, 50. ----, ----, ----, of Mexico equivalent to that of the Carolinas, xx, 124. ----, Boletus igniarius, analogous to animal substances, vi, 177. ----, Crotalus reliquus, xx, 122.^f ----, gases and salts forming near Erie canal, xv, 233. ----, living antediluvial animals, xv, 233. ----, number _five_ a favorite in nature, xvi, 172. ----, magnetic needles, improvement in manufacture of, xii, 14. ----, trilobites, xxii, 165. ----, notice of new edition of the Geological Text Book of, xxii 391. ----, remarks by _D. Thomas_ on the views of, on the coal formations of New York, xix, 326.

Ebullition by cold, apparatus for producing, _R. Hare_, xxxiii, 248.^f

Echinus, see ZOOLOGY, _Radiata_.

Echo, in Virginia, _C. G. Page_, xxxvi, 174. ----, in N. York state, _J. B. Church_, xxxvi, 175. ---- a means of determining the depth of a sea, not effectual, _C. Bonnycastle_, xxxviii, 160.

Eclipse, solar, Feb. 12, 1831, xxii, 189. ----, ----, in 1834, observation on, _L. Brant_, xxvii, 386. ----, ----, of May, 1836, observations on, xl, 29. ----, ----, of Sept., 1838, observations on, xxxviii, 158, 163, 172, 174; xl, 29. ----, ----, ----, observations on, _D. Olmsted_, xxxv, 174. ----, ----, ibid, micrometric measures, _E. P. Mason_, xxxv, 176. ----, ----, of July, 1842, xlii, 175; xliii, 401; xliv, 211. ----, ----, ----, observations suggested by, xlii, 395.

Edinburgh, on the geology of Calton Hill, near, _J. W. Webster_, i, 230.^f ----, freshwater limestone of Burdie House, _S. Hibbert_, xxviii, 365.

_Edmondson, T._, modification of _Ampère's_ rotating galvanic element, xxvi, 370.^f ----, rotating armatures, xxvi, 205^f; xxxii, 399.

Education in Africa, ii, 343. ---- ----, in Egypt, xii, 389. ---- in England, number of students at Cambridge and Oxford, xix, 195. ---- in Europe, by schools of mutual instruction, iv, 199. ---- ----, in Austria, Vienna Polytechnic Institute, x, 379. ---- ----, in Belgium, at Brussels, vii, 382. ---- ----, in Denmark, xii, 189; xiii, 173; xvii, 394. ---- ----, ----, at Copenhagen, x, 175. ---- ----, ----, ----, bequest for, ix, 183. ---- ----, ----, ----, deaf and dumb, xii, 197. ---- ----, in France, vii, 199; xii, 392. ---- ----, ----, in Paris, free commercial school, x, 171. ---- ----, ----, ----, _M. Cochin's_ munificence, xvii, 394. ---- ----, ----, at Caen, in prison, v, 382. ---- ----, ----, at Lyons, xx, 174. ---- ----, ----, at Marseilles, v, 191. ---- ----, in Germany or Prussia, viii, 185; xiii, 159; xx, 388. ---- ----, ----, Halle University, xiv, 381. ---- ----, ----, Berlin Rural School, ix, 187. ---- ----, ----, at Munich, iv, 196. ---- ----, ----, Wurtemberg university, viii, 183. ---- ----, in Greece, at Chios, iv, 196. ---- ----, in Holland or Netherlands, xviii, 182. ---- ----, ----, at Maestricht, by mutual instruction, v, 386. ---- ----, in Hungary, xiii, 165. ---- ----, in Poland, at Warsaw, ix, 186. ---- ----, in Portugal, vii, 198; ix, 187. ---- ----, in Russia, v, 176; xx, 176. ---- ----, ----, St. Petersburg Greek Seminary, vi, 387. ---- ----, ----, endowment of schools by a princess, iv, 386. ---- ----, in Sweden, ix, 182. ---- ----, in Switzerland, vi, 391; vii, 381; xii, 191; xiii, 397. ---- ----, ----, at Bâle, rural school, ix, 368. ---- ----, ----, at Geneva, v, 179, 380; x, 383. ---- in U. States, xx, 413. ---- ----, in New York, xv, 401; xxii, 415; xxv, 258; xxvii, 177; xxx, 389; xlix, 176. ---- ----, in Connecticut, N. Haven Gymnasium, xiii, 385. ----, different systems of, _W. Maclure_, ix, 160, 163. ----, mutual instruction schools in Europe, iv, 199. ----, _M. Ordinaire's_ method, vii, 199, 383. ----, Owen's plan, ix, 383. ----, Owen's establishment, x, 165. ----, Pestalozzian system, _W. Maclure_, ix, 163; x, 145. ----, new method in Latin, v, 182. ---- of the poor, iii, 379. ----, American Annals of, _W. C. Woodbridge_, xix, 174, 357. ---- and government of boys, vii, 161. ----, original papers relating to a course of liberal, xv, 297.

_Edwards, J._, observations on spiders, xxi, 109.^f

Edwardsite, new mineral, with an analysis, _C. U. Shepard_, xxxii, 162. ----, identical with monazite, _G. Rose_, xxxix, 249. ----, ibid, _C. U. Shepard_, xxxix, 251. ----, crystallization of, xxxiii, 202.^f

Eggs, artificial incubation, ix, 196. ----, mode of blowing for preservation, xxi, 161. ----, means of preserving, v, 379. ----, Scotch method of preserving, xxvi, 188.

Egypt, notices of, xxviii, 23.^f ----, notice of works in, iii, 378. ----, ---- the canal of Mahommaddie, xxviii, 27. ----, ---- the Nile, xxviii, 28. ----, ---- Mahomet Ali, xxviii, 30. ----, education in, xii, 389. ----, embalmed ibis, bat, &c. from, _S. G. Morton_, xli, 187. ----, statistics of, vi, 389. ----, position of Memphis in, xxxi, 373.

Egyptian crania, observations on, _S. G. Morton_, xlviii, 268.

_Ehrenberg, C. G._, on recent and fossil infusoria, xxxiii, 111; xxxv, 371^f; xxxvii, 116. ----, ibid, American, distribution, extent and influence of, xliii, 393; xlvi, 297.^f ----, ----, ----, in Virginia, xlvi, 300; xlviii, 201. ----, ----, ----, in New York, at West Point, xlvi, 303. ----, ----, at Berlin, xlii, 388. ----, ----, general results of researches on, xlvii, 208. ---- and _Hemprich_, journey in northern Africa, vii, 195.

Elaine from oils, new mode of obtaining, _M. Pechet_, ix, 189. ----, separation of, from oils, xiii, 186. ----, and stearine, vi, 377.

Elasticity, an experiment on, with wine-glasses, xxii, 190.^f

Elaterite, or fossil caoutchouc, xl, 215.

Electrepeter, _Clarke's_, xxxiii, 224.^f ----, new form of, _C. G. Page_, xxxiii, 377.^f ----, magnetic and electrotome, _C. G. Page_, xxxv, 112.^f

Electric amalgam, _W. R. Johnson_, xxv, 68. ---- battery, i, 292.^f ---- brush, _R. Hare_, xxxii, 277.^f ---- currents along the muscles and nerves different, xix, 180. ---- ---- in the nerves, on the hypothesis of, _M. Matteucci_, xlix, 387. ---- ----, course of, in electric discharges, _W. R. Johnson_, xxv, 58. ---- ----, effect of placing a candle between the poles, _W. R. Johnson_, xxv, 59. ---- ----, two or more over the same conductor without interference, _S. F. B. Morse_, xliv, 418.^f ---- ---- and sparks from magnets, _J. Henry_, xxii, 403. ---- ----, ponderable matter transported by, xii, 383. ---- discharges, lateral, _J. Henry_, xxxiv, 16.^f ---- discriminator, (electroscope,) _R. Hare_, xxv, 136.^f ---- excitement in leather by friction, xxxvii, 197. ---- ----, peculiar case of, in a woman, xxxiii, 394; xl, 386. ---- experiments, season favorable for, _W. R. Johnson_, xxv, 60. ---- fish, on the coast of Cape Cod, _D. H. Storer_, xliv, 213. ---- ----, Gymnotus, xl, 386. ---- fluids, the existence of two, opposed by _R. Hare_, vii, 103.^f ---- ----, observations on, _C. G. Page_, xxxvi, 353. ---- induction, decomposition of water by, _M. Hachette_, xxiv, 142. ---- ----, currents of electricity from, of different orders, _J. Henry_, xxxviii, 232.^f ---- ----, polarity produced by, xxxviii, 3. ---- ----, _R. Hare_, letters on, to _M. Faraday_, xxxviii, 1, 19; xli, 1. ---- ----, _M. Faraday_, in reply to _R. Hare_, xxxix, 108; xlii, 291. ---- jar, on the discharge of, xxxviii, 6. ---- kite, for determining the electricity of the upper currents of the air, _J. Swaim_, xxxii, 304.^f ---- lady, explanation of, xxxiii, 394; xl, 386. ---- light, a mode of producing, viii, 380. ---- machine, form and arrangement of, _W. R. Johnson_, xxv, 66. ---- ----, plate, viii, 378. ---- ----, ----, _R. Hare_, vii, 108^f; xxxii, 272.^f ---- ----, communication of, with the earth not necessary, _R. Hare_, xxiv, 253. ---- pile, theory of, xix, 375. ---- shock from a cat, mode of receiving, viii, 391. ---- sound, xlix, 390. ---- spark, _W. R. Johnson_, xxv, 57. ---- ----, length of, as affected by the size of the balls, _W. R. Johnson_, xxv, 60. ---- ----, perforations by, in a quire of paper or card, _W. R. Johnson_, xxv, 64. ---- ----, ----, ibid, _C. G. Page_, xxxvi, 353. ---- ---- drawn from a heated stove, xl, 385, 386. ---- ----, remarks on the so-called positive and negative, _R. Hare_, xxxii, 275.^f ---- ----, _Wheatstone's_ experiment to determine whether there is a sensible duration to, xxviii, 60. ---- ----, from magnets, _J. Henry_, xxii, 403. ---- ----, ----, _J. P. Emmet_, xxiv, 78.^f ---- syringe, _C. G. Page_, xxvi, 110.^f

ELECTRICITY.

----, animal, mode of receiving a shock from a cat, viii, 391. ----, ----, peculiar case in a woman, xxxiii, 394; xl, 386. ----, ----, of fish on the coast of Cape Cod, _D. H. Storer_, xliv, 213. ----, ----, _Matteucci_ on, xxi, 157. ----, ----, observations on, _Linari_ and _Matteucci_, xxxii, 198; xlix, 388. ----, atmospheric, water decomposed by, xx, 179; xxi, 368. ----, ----, observations on, _M. Matteucci_, xxx, 376. ----, blasting by means of, xvi, 372.^f ----, capillary attraction influenced by, _J. W. Draper_, xxvi, 399. ----, ----, ---- productive of, ix, 193. ----, conducting power of liquid gases, xxi, 374. ----, ----, ---- of the metals, xii, 199. ----, ----, ---- of steam, xxvii, 206. ----, ----, ---- of the solar rays, xvii, 391. ----, the conductibility of, by liquids, increased by adding water, xvii, 165. ----, by contact, _Karsten_, xxxi, 159. ----, decomposition of water by atmospheric and common, xxi, 368. ----, discharge, lateral, _J. Henry_, xxxiv, 16.^f ----, effects of, on vegetation, _M. Baric_, xxxi, 160. ----, fluids of, one or two, _R. Hare_, vii, 103.^f ----, ----, ibid, _C. G. Page_, xxxvi, 353. ----, generation of, by the electrical machine, _G. W. Rains_, xlix, 93.^f ----, evaporation in gilding, producing, v, 198. ----, induced currents of different orders produced by, _J. Henry_, xxxviii, 232.^f ----, influence of, on the process of beer making, xxxiv, 8. ----, ----, on capillary attraction, xxvi, 399. ----, ----, on odors, xv, 394. ----, ----, on phosphorescence, _T. J. Pearsall_, xxi, 378. ----, light acting on an iodized plate, producing, xlvii, 190. ----, machinery producing, _A. Smith_, xxxix, 134. ----, medical, _J. Hall_, iii, 166. ----, motion producing and motion produced by, _J. Locke_, xxxiv, 130. ----, needle deflected by, xii, 199. ----, of peroxide of manganese, xxx, 179. ----, ponderable substances transferred by, _A. Fusinieri_, xxii, 355. ----, principles of, in 1833, _A. de la Rive_, xxvi, 175. ---- produced by the action of light on an iodized silver plate, xlvii, 190. ---- ---- by machinery, _A. Smith_, xxxix, 134. ---- ---- by a separation of parts, or fracture, viii, 379. ---- from steam, xl, 382. ---- of the tourmaline, xvi, 390. ---- retained in a vacuum, xxix, 354. ----, science of, in 1833, _A. de la Rive_, xxvi, 175. ----, theory of, _J. D. Whelpley_, xlviii, 364. ----, ----, _Van Marum_ on, iii, 385. ---- and magnetism, connection between, iii, 386.^f ----, heat and magnetism, on the connection of, _J. F. Dana_, vi, 163.^f ----, thermo-, see _Thermo-Electricity_. ----, Galvanic battery, _E. de Butts_, viii, 271.^f ---- ---- of carbon, xxxix, 132. ---- ---- ----, _B. Silliman, Jr._, xliii, 393; xliv, 180.^f ---- ----, _Crosse's_, some account of, xxxii, 372. ---- ----,_ De la Rive's_, v, 395. ---- ----, dry, xii, 195; xvii, 162. ---- ----, _Grove's_, xxxviii, 116. ---- ----, ----, experiments with, _S. F. B. Morse_, xlv, 390.^f ---- ----, _R. Hare's_ new modifications of, iii, 105.^f ---- ----, ----, calorimotor, i, 413; v, 94, 357, 364; vi, 337; xxxii, 284.^f ---- ----, ----, deflagrator, iii, 105^f; iv, 201; v, 94; vi, 337; vii, 347^f; viii, 99; ix, 181; xl, 48. ---- ----, ---- ----, improved form of, _M. Faraday_, xxxii, 170. ---- ----, ----, combining the advantages of the trough of Cruikshank with the deflagrator, xxxii, 285.^f ---- ----, of great power, _F. W. de Moleyns_, xliv, 357. ---- ----, _J. Henry_, on a spark from a long conductor uniting the poles of, xxviii, 327. ---- ----, ----, action of a spiral conductor, xxviii, 329. ---- ----, _C. G. Page_, on iron or any metal a substitute for copper, xxxii, 197. ---- ----, ----, on the benefit of fresh immersion, xxxvi, 137.^f ---- ----, _W. B._ and _H. D. Rogers_, experimental enquiry into some of the laws of, xxvii, 39.^f ---- ----, ----, relative influences of the zinc and copper, xxvii, 41. ---- ----, ----, examination of _Ritchie's_ law of surface, xxvii, 53. ---- ----, ----, influence of temperature, xxvii, 57. ---- ----, _J. B. Rogers_ and _J. Green_, ibid, xxviii, 33. ---- ----, ----, relative importance of the zinc and copper, xxviii, 34. ---- ----, ----, relative distance of the plates, xxviii, 39. ---- ----, ----, deflecting power from different menstrua, xxviii, 40. ---- ----, _W. Sturgeon_, difference in the effects of the two polar wires, xxxix, 31.^f ---- ----, _Watkins'_ dry, xvii, 162. ---- blasting, _R. Hare_, xxi, 139; xxvi, 352^f; xxxviii, 188. ---- ----, _H. K. G. Morgan_, xxxviii, 33. ---- calorimotor, _Hare's_, i, 413^f; v, 94, 357, 364; vi, 337; xxxii, 284.^f ---- ----, for galvano-ignition apparatus, _R. Hare_, xxxii, 284.^f ---- circle, theory of, _T. Graham_, xxxviii, 117. ---- currents, caloric a cause of, _J. P. Emmet_, xxv, 269. ---- ----, remarks on, xviii, 199.^f ---- ----, and sparks from the horse-shoe magnet, _J. P. Emmet_, xxiv, 78.^f ---- deflagrator, _Hare's_, iii, 105^f; iv, 201; v, 94; vi, 337; vii, 347^f; viii, 99; ix, 181; xl, 48. ---- ----, improved form of, _M. Faraday_, xxxii, 170. ---- experiments by _A. Crosse_, producing crystals, and, as supposed, insects, xxxv, 125.^f ---- ----, by _R. Hare_, viii, 145. ---- ----, with grasshopper's legs, _J. W. Bailey_, xxxi, 292.^f ---- ignition of gunpowder, _R. Hare_, xxxvii, 269. ---- induction, _J. P. Emmet_, xxvi, 23.^f ---- lamp, an improvement in, by _Dr. J. Cutbush_, ii, 332. ---- light, transmission of, through metals of different conducting powers, _J. Thomas_, xxxiv, 205.^f ---- ----, daguerrotype experiment by, _B. Silliman, Jr._ and _W. H. Goode_, xliii, 185. ---- multiplier, see _Galvanometer_. ---- music, production of, _C. G. Page_, xxxii, 396; xxxiii, 118. ---- phenomenon, attending the soldering of water pipes in N. York city, xvii, 194. ---- protection by the contact of heterogeneous metals, xvi, 263. ---- trough, _Watkins's_, xvi, 215.

_Galvanism_, anthracite a conductor of, v, 200. ----, charcoal fused by, v, 108, 361; viii, 147, 288; xxxviii, 190. ----, ---- ----, _L. Vanuxem's_ examination of, viii, 292. ----, on colors supposed to be transferred by, through animal substances, _A. Jones_, xxi, 316. ----, _A. Crosse's_ experiments in, see _Crosse_. ----, crystallization of metals by, _G. Bird_, xxxiii, 267. ----, ----, _M. Becquerel_, xvii, 383. ----, crystals and insects, _A. Crosse_, xxxv, 125.^f ----, engravings copied by, _von Kobell_, xlviii, 221.^f ----, engravings and medals by, _T. Spencer_, xl, 157.^f ----, fossils copied by, xlii, 327. ----, gilding by, xli, 402. ----, insects supposed to be produced by, xxxii, 374^f; xxxiii, 272; xxxv, 125^f; xlix, 227. ----, ----, ----, _W. H. Weekes_, xliii, 395. ----, grasshopper's legs, a substitute for frogs, _J. W. Bailey_, xxxi, 292.^f ----, insulation of wires, a mode of, proposed, _A. A. Hayes_, xx, 409. ----, metals precipitated by, structure of, _W. de la Rue_, xlix, 390. ----, minerals changed by, _R. W. Fox_, xxxi, 373. ----, results from heat of, and decomposition, _W. Sturgeon_, xxxix, 29. ----, shocks from the calorimotor, how increased, _C. G. Page_, xxxi, 137.^f ----, size of plates, influence of, in, xxvii, 189. ----, theory of, _Prof. Pfaff_, xix, 178. ----, theory of, _R. Hare_, i, 413.^f ----, theory of, _Schönbein_, xxxviii, 119.

Galvanography, _von Kobell_, xlviii, 221.^f ----, _T. Spencer_, xl, 157.^f ----, fossils copied by, xlii, 327.

Galvano-ignition apparatus, _R. Hare_, xxxii, 282.^f

Galvanometer, _R. Hare's_ improved, xxvi, 359.^f ----, ----, rotary multiplier, xxxviii, 339.^f ----, _J. Henry_, on the application of, to electro-magnetic apparatus, xix, 400.^f ----, _J. Locke_, notice of a new, xxvi, 103^f, 378.^f ----, ----, large thermoscopic, xxxiii, 365. ----, _J. P. Emmet's_, new form of, xxvi, 311. ----, _C. G. Page_, on the use of, xxxii, 354.^f ----, ----, astatic or rotary, xxxiii, 376.^f ----, ----, axial, xlix, 136.^f ----, ----, circular, xxxv, 259.^f ----, modified, _W. B._ and _H. D. Rogers_, xxvii, 39.^f

Galvanoscope, a means of detecting the failure of water in steam boilers by, _C. G. Page_, xxxvi, 141.^f

Galvano-magnetic condenser, v, 394. ---- - ----, apparatus, _J. F. Dana_, vi, 330.^f ---- - ----, ----, Italian, v, 388.

Electro-chemical action, _G. D. Botto_, xxiv, 197; xxix, 369. ---- - ----, odor, _ozone_ the cause of, _Schönbein_, xli, 43.

Electro-dynamic induction of coils, _J. B. Zabriskie_, xxxii, 308.^f ---- - ----, ----, various experiments in, and principles deduced, _J. Henry_, xxxviii, 170, 209.^f ---- - ----, ----, observations on, _J. Henry_, xli, 117.^f ---- - ----, ----, two kinds of, _J. Henry_, xli, 129.^f ---- - ----, ----, theoretical considerations, _J. Henry_, xli, 135.^f

Electro-magnet, _Henry's_ large, xix, 408.^f ---- - ----, made for the Laboratory of Yale College, xx, 200. ---- - ----, a variety of, proposed, _J. Humbert_, xxxviii, 205. ---- - ----, _Mr. Ganby's_, xxix, 354. ---- - ----, _C. G. Page's_, xxxv, 253.^f ---- - ----, see farther under _Electro-magnetic apparatus_.

Electro-magnetic apparatus, _J. H. Abbot_, xl, 104.^f ---- - ---- ----, _P. Barlow_, v, 396.^f ---- - ---- ----, _A. W. Campbell's_ engine, xxxv, 343. ---- - ---- ----, _E. M. Clarke_, (magneto-electric) xxxiii, 213^f; --electrepeter, xxxiii, 224.^f ---- - ---- ----, ----, modes of experimenting with, in decomposing water, xxxiii, 217.^f ---- - ---- ----, ----, mode of giving shocks, xxxiii, 216.^f ---- - ---- ----, ----, mode of scintillating iron wire, xxxiii, 219.^f ---- - ---- ----, ----, mode of adjusting the intensity armature, xxxiii, 218.^f ---- - ---- ----, ----, rotation by magnetic electricity, xxxiii, 221.^f ---- - ---- ----, ----, mode of igniting charcoal, xxxiii, 222.^f ---- - ---- ----, _T. Davenport_, xxxii, Append. after 216; xxxiii, 193. ---- - ---- ----, ----, rotary, xxxii, 216^f, App., and 399. ---- - ---- ----, _T. Edmonson_, modification of Ampère's rotating, xxvi, 370.^f ---- - ---- ----, ----, rotating armature, xxvi, 205^f; xxxii, 399. ---- - ---- ----, _J. Henry's_ application of a galvanic multiplier, xix, 400.^f ---- - ---- ----, _J. B. Joslin_, xxi, 86.^f ---- - ---- ----, _J. Locke_, and on magneto-electricity, xxxiv, 125.^f ---- - ---- ----, _B. R. McConnell's_ rotating, xxxiii, 188. ---- - ---- ----, _C. G. Page_, xxxiii, 191^f; xxxiv, 364; xlix, 131.^f ---- - ---- ----, ----, double axial reciprocating engine, xlix, 139.^f ---- - ---- ----, ----, with revolving armature, xxxvi, 350.^f ---- - ---- ----, ----, _C. G. Page_, compound electro-magnet, xxxv, 253.^f ---- - ---- ----, ----, electrotome, xxxv, 112^f, 253.^f ---- - ---- ----, ----, reciprocating armature engine, xxxv, 263.^f ---- - ---- ----, ----, with vibrating armature, xxxv, 267.^f ---- - ---- ----, ----, circular galvanometers, xxxv, 259^f;--with double helix for inducing magnetism, xxxv, 261.^f ---- - ---- ----, ----, electrepeter, new form of, xxxiii, 377^f; xxxv, 112.^f ---- - ---- ----, _W. H. Pepys_, vii, 195. ---- - ---- ----, _M. Pixii_, xxiv, 144, 146^f, 196. ---- - ---- ----, _J. B. Zabriskie_, model of engine, xxxii, 313.^f ---- - ---- ----, ----, rotating, xxxvi, 129.^f ---- - ---- currents, _A. de la Rive_, xxxiv, 6. ---- - ---- disc of _Arago_, xxiv, 143. ---- - ---- induction, see _Electro-dynamic_. ---- - ---- and magneto-electric formula, xxxv, 356.^f ---- - ---- properties of metalliferous veins, _R. W. Fox_, xx, 136. ---- - ---- telegraph, _S. F. B. Morse's_, xxxiii, 185.^f ---- - ---- ----, see farther, _Magneto-electric_.

Electro-magnetism, early experiments in, iii, 383; v, 391. ---- - ----, experiments in, _J. H. Abbot_, xl, 104.^f ---- - ----, _J. P. Emmet's_ discoveries (magneto-electric) in, xxiv, 78^f; xxvi, 311; xxviii, 331. ---- - ----, ----, on the cause of voltaic currents in, xxvi, 23.^f ---- - ----, _R. Hare's_ experiments, viii, 145. ---- - ----, _R. Hare's_ experiments, in confirmation of _Henry's_, xx, 143. ---- - ----, _M. Jacobi_ on, as a moving power, xl, 339. ---- - ----, ----, ibid, laws of, xl, 340. ---- - ----, _G. Moll's_ experiments in, xix, 329. ---- - ----, ---- experiments to determine how far galvanic surfaces could be diminished and retain magnetic power, xxvi, 177. ---- - ----, _C. G. Page's_ experiments on the application of, as a moving power, xxxiii, 118, 190^f; xxxv, 106. ---- - ----, _M. Pixii's_ experiments in, xxiv, 144, 146^f, 196. ---- - ----, _J. B. Zabriskie_, on the induction of metallic coils, xxxii, 308.^f

Electrometers, iii, 372.

Electrometer, single leaf, _R. Hare_, vii, 351^f; viii, 99; xxv, 136.^f

Electromotors, _S. Dal Negro_, xxvii, 189. ----, new property of elementary, _S. Dal Negro_, xxv, 193.

Electrography, gilding by, xli, 402. ----, _v. Kobell_ on, xlix, 221.

Electroscope, _R. Hare_, xxv, 136.^f

Electrotome, _C. G. Page_, xxxv, 112^f, 253.^f

Electrotype, account of, _T. Spencer_, xl, 157.^f

Elephant, death of, iv, 393. ---- of Siberia, xxvii, 353. ----, fossil, near Bloomfield, Ohio, xxv, 256. ----, ----, Jackson Co., Ohio, xxxiv, 358^f, 363.^f ----, ---- remains, Irondiquot Creek, xxxii, 377. ---- bones and Mylodon (?) from Oregon, _H. C. Perkins_, xlii, 136.^f ---- ----, from near Beering's Straits, xvi, 382. ---- tooth, from near the shores of Lake Erie, xiv, 31.

Elevation above the ocean of some heights in Ohio, Michigan, Pennsylvania and New York, _C. Whittlesey_, xlv, 12. ---- ---- ibid in western New York and of Lake Erie, _C. Dewey_, xxxiii, 122. ---- ---- ---- in Wisconsin, _I. A. Lapham_, xlvi, 258.