_Melloni, M._, investigations on heat, xxiii, 185; xl, 313. ----, on radiant heat and diathermancy, xxvii, 228. Melville Island, rocks of, xvii, 10. Memoir, see _Obituary_. Memory, the process of, _I. Orr_, xxiii, 278. ----, loss of, from the use of gin, xxvi, 211. Menardite, supposed new mineral, from Spain, xii, 385. Mengite, xxvi, 388; xxxix, 249. Mental aberration as connected with civilization, xxii, 379. Mercapian, _Zeise_, xxix, 368. Mercurial atmosphere, iii, 385. Mercury, atomic weight of, xvi, 183; xlviii, 402. ----, amalgam of, _W. W. Mather_, xxvii, 263. ----, congelation of, vii, 192. ----, method of detecting small quantities of, vii, 392. ----, combination of, with metallic wires, xvii, 375. ----, elastic force of the vapor of, _M. Avogadro_, xxiv, 286. ----, on the vaporization of, in nitric ether, _S. Guthrie_, xxi, 90. ----, germination on, xix, 202. ----, passage of, from a vessel through a bar of lead bent like a syphon, xxxviii, 180. ----, iodide of, _W. W. Mather_, xxvii, 263. ----, compounds of, _Donovan_, ii, 350. ----, sesqui-sulphate of, xviii, 364. ---- mines of Spain, xxviii, 21. ---- ---- of Idria, xxix, 219. Mercury, observations on the transit of, May, 1845, _D. Olmsted_, xlix, 142. Meridian, measurement of, v, 190. ----, length of a degree of, _T. J. Cram_, xxxi, 222.^f ----, formula for the establishment of a true, xxv, 261.^f Merino sheep, v, 189. Mermaid, ii, 178; vi, 195. Mesotype in N. Hampshire, xviii, 133. ---- in New Jersey, v, 239; xl, 69. Metagallic acid, _Pelouze_, xxviii, 126. Metals, action of, on inflammable gases, xvii, 168. ----, apparatus for combustion of metals in chlorine, xiv, 354.^f ----, crystallization of, by galvanic influence, _G. Bird_, xxxiii, 267. ----, distribution of, according to their electric qualities, _J. P. Emmet_, xxv, 272. ----, electro-chemical reduction of, _Becquerel_, xxxi, 164. ----, electro-precipitated, structure of, xlix, 390. ----, letters on, permanent after fusion, xxv, 197. ----, reduction of, by azote, xix, 371. ----, singular modifications of the ordinary action of nitric acid on, xxxiii, 286. ----, solubility of, in persulphate and perchloride of iron, _J. Napier_, xlviii, 190. ----, new, aurum millium, ii, 363. ----, ----, didymium, xliii, 404. ----, ----, donium, xxxi, 163. ----, ----, erythronium, supposed new, xx, 386. ----, ----, lanthanium, xxxvii, 192. ----, ----, pelopium and niobium, xlviii, 400. ----, ----, ruthenium, xlviii, 401. ----, ----, selenium, i, 310. ----, ----, thorium, xvii, 381. ----, ----, vanadium, xx, 386. ----, sulphurets, new method of precipitating, xlvii, 193. Metallic casting, vii, 190. ---- decompositions by phosphuretted hydrogen, xviii, 403. ---- salts, _C. Matteucci_ on the decomposition of, xx, 187. ---- vegetation, ii, 349. ---- wires and springs, on tempering, xx, 393.