Mathematical instrument, short notice of a new, iv, 377. ---- problems, _T. Strong_, ii, 54^f, 266.^f _Mather, W. W._, mode of obtaining aluminium and magnesium, xx, 408. ----, chloride of aluminium and its analysis, xxvii, 241. ----, hydrated chloride of aluminium, xxvii, 253. ----, solubility of bitungstate of ammonia, xxvii, 264. ----, disulphuret of bismuth, xxiv, 189; xxvii, 264. ----, bromine and iodine in the salt springs of Ohio, xlix, 211. ----, new method of cupellation, xxxv, 321. ----, Georgia gold, xxvii, 255. ----, crystalline form of iodine, xviii, 84.^f ----, ibid, of xanthite, xviii, 359.^f ----, amalgam of platinum, xxvii, 263. ----, iodide of mercury, xxvii, 263. ----, chloriodide of platinum, xxvii, 258. ----, perchloride of platinum, xxvii, 262. ----, iodide of potassium and platinum, xxvii, 257. ----, reduction of iron and silver ores, and on some Mexican and S. American silver mines, xxiv, 213. ----, silver of Lane's mine, Connecticut, xxvii, 256. ----, crystallized tin from solution, xxvii, 254. ----, non-conducting power of water, in relation to heat, xiii, 368.^f ----, instrument for measuring the expansion of solids, xxx, 324.^f ----, on the possible variation of the length of the day, xlvi, 344. ----, a geological section through a part of Connecticut from Killingly to Haddam, xxi, 94.^f ----, geology of the Highlands of New York, xxi, 97. ----, geological survey of Ohio, xxxiv, 196, 347; xl, 126. ----, physical geology of the U. States, east of the Rocky Mountains, xlix, 1, 284. ----, elevation of sedimentary rocks of United States, causes of, xlix, 284. ----, protest with reference to G. W. Featherstonhaugh, xxxiii, 205. Matter, infinite divisibility of, _E. Adams_, xxviii, 163. ----, ---- ----, _S. Clark_, ix, 356. ----, ---- ----, _W. Whewell_, xxxviii, 113. ----, ---- ----, xxxix, 55.^f ----, heavy, demonstration of, _W. Whewell_, xlii, 264. ----, ----, reply to _W. Whewell_ on, _R. Hare_, xlii, 260. ----, motion the natural state of, xvi, 151. ----, on the vitality of, xv, 54. _Matteucci, C._, on electric currents in the nerves, xlix, 387. ----, on animal electricity, xxi, 157; xxxii, 198; xlix, 388. ----, on the decomposition of metallic salts, xx, 187. ----, influence of heat on magnetism, xxii, 361. ----, on atmospheric electricity, xxx, 376. Mauch Chunk, river, canal and coal region, _B. Silliman_, xix, 7.^f ----, notice of, xx, 163. Mauna Loa, Hawaii, character of, xvi, 346. ---- ---- and Mauna Kea, Sandwich Islands, xi, 4. ---- ----, see farther under _Volcano_. _Mauran, J._, improved instrument for venous injection, xxiii, 114.^f