---- at the bottom of the ocean not necessarily diffused by upward currents, _W. C. Redfield_, xlv, 138. ---- and light, _S. Morey_, ii, 118, 122. ---- and vapor, inquiries respecting, _W. R. Johnson_, xxi, 304. ----, see further under _Meteorology_ and _Temperature_. Heated waters, an agent in producing metamorphic changes, _J. D. Dana_, xlv, 104. Heating houses by furnaces below, some important precautions, xxxiv, 84. Heavy spar, of Berlin, Ct., analysis of, _G. T. Bowen_, iv, 325. ----, localities of, in Canada, viii, 72. ----, ----, in Carolina, iii, 4; v, 257. ----, ----, in Connecticut, i, 240; ii, 373; iv, 325; v, 40, 42.^f, 254; vi, 211. ----, ----, in Massachusetts, i, 115; vi, 211. ----, ----, in New Jersey, xxxvi, 103. ----, ----, in New York, i, 237; ii, 173, 368; v, 28; vii, 56; viii, 249; xxv, 346; xxvii, 364; xxviii, 175. ----, ----, in Tennessee, i, 63. ----, ----, in Virginia, i, 63. ----, ----, in Sicily, viii, 205. Hebrew words, orthography of, _J. W. Gibbs_, xxiv, 87. _Heckewelder, John_, labors of, xxxi, 64, 66. Height, on the measurement of, by boiling water, xxxvii, 19. ----, mean, of the continents above the sea, xlix, 397. ---- of Lake Erie and various places in western New York, _C. Dewey_, xxxiii, 122. ---- of places in Ohio, Michigan, Pennsylvania and New York, _C. Whittlesey_, xlv, 12. ---- ---- in Wisconsin, _I. A. Lapham_, xlvi, 258. Hematite, see _Iron Ore_. Hemlock, reaction of sulphuric with the essential oil of, xxxvii, 246. Hemming's safety tube, _J. W. Webster_, xxxvii, 104. Hemorrhage, remedy for, v, 409. Hemp, Manilla, account of, xli, 200.^f _Hemprich_ and _Ehrenberg_, notice of journey by, in Northern Africa, vii, 195. _Henry, J._, electro-dynamic induction, xxxviii, 209^f; xli, 117.^f ----, large, xix, 408.^f ----, electro-magnetic experiments, by, xxii, 403. ----, ---- apparatus, application of galvanic multiplier to, xix, 400.^f ----, ---- ----, remarks in confirmation of, _J. W. Webster_ and _R. Hare_, xx, 143. ----, magnetism, production of currents of electricity and sparks from, xxii, 403. ----, magnetic attraction and repulsion, reciprocating motion of, xx, 340.^f ----, ---- needle, disturbance during an Aurora, xxii, 143. ----, soap-bubble, experiments with, on molecular attraction, xlviii, 215. ----, spark from a long conductor in a galvanic battery, xxviii, 327. ----, spiral conductor, action of, xxviii, 329. _Henry, W._, on the disinfecting powers of increased temperatures, xxi, 392; xxii, 111.^f ----, philosophical character of Priestley, xxiv, 28. _Hentz, N. M._, on North American spiders, xxi, 99.^f ----, a new sub-genus of spiders, xli, 116.^f Hepatic blende, xlii, 387. Herbaria, European, notices of, xl, 1. Herculaneum manuscripts, ii, 340.