_Ellet, W. H._, on the compounds of cyanogen, xviii, 329. Ellipses, mode of drawing, _S. De Witt_, xxiv, 369.^f ----, on the rectification of, _C. Wilder_, xviii, 38.^f Elliptic motion, _T. Strong_, xxx, 248. Elm-tree moth, parasite of the eggs of, xxxviii, 385. ----, destruction of the eggs of, by a parasite, _E. C. Herrick_, xl, 211. Embalming, remarks on the mode of, xii, 183. ----, _J. N. Gannal's_ new process, xl, 194. Emerald in Africa, ii, 354. _Emerson, G. B._, biographical notice of A. P. De Candolle, xlii, 217. Emery of Saxony, xxiv, 377. _Emmet, J. P._, on formic acid, xxxii, 140. ----, ammoniacal salts, solvent and oxydating powers of, xviii, 255. ----, iodide of potassium a test for arsenic, xviii, 58. ----, electro-magnetism and thermo-electricity, xxvi, 311. ----, ----, new discoveries in, xxiv, 78.^f ----, ----, cause of currents in, xxvi, 23.^f ----, solidification of raw gypsum, xxiii, 209. ----, a mode of producing sparks and galvanic currents from the horse-shoe magnet, xxiv, 78.^f Emmonite, supposed new mineral, _T. Thomson_, xxxi, 171. _Emmons, E._, birds of spring, time of appearance in Williamstown, Mass., 1831-33, xxvi, 208. ----, circulation in vegetables, xxvi, 99. ----, granitic veins and beds of Chester, Mass., viii, 250. ----, Grevilleanum serratum, a new species of moss, xi, 183.^f ----, metamorphic changes by artificial heat, in sandstone, xlv, 146. ----, rainmarks in the Potsdam sandstone, xlv, 316. ----, strontianite in the U. States, xxvii, 182. Enamel for porcelain, v, 189. Enamelled cast iron vessels in Bohemia, xlix, 400. Encroachment of the sea, near New York, _W. W. Mather_, xxxvi, 16. Endogenites, vii, 179. Enfield's Natural Philosophy, review of, iii, 125. England, population of, xxiv, 211. _Engelmann, G._, Braun's monography of N. American Equiseta, with additions, xlvi, 81. ----, Braun's Charæ of N. America, xlvi, 92. ----, catalogue of a collection of plants in Illinois and Missouri, xlvi, 94. ----, monograph of the N. American Cuscutineæ, xliii, 333^f; xlv, 73. ----, a mode of cupellation, xlii, 394. Engine, explosive, of _S. Morey_, account of, xi, 104. ----, steam, see _Steam engine_. English lexicography, contributions to, _J. W. Gibbs_, xxxiii, 324; xli, 28, 32; xlv, 96. Engraving, a mode of enlarging, ii, 342. ----, a mode of biting-in, on steel, x, 194. ----, in _taille douce_, iv, 192. ---- on steel, _Perkins's_ invention, iii, 353. Epicycloid, on the, _E. F. Johnson_, xxi, 280.^f Epidemics, in Paris, during past years, xxv, 197.