Hone-slate of N. Carolina, xiv, 238. _Hooker, W. J._, on the Botany of America, ix, 263. Hop, chemical examination of, _A. W. Ives_, ii, 302. Hops, analysis of, vi, 393. ----, lupuline from, xii, 388. _Hopkins, M._, on mystery, xiii, 217. _Hopkins_, on the geological phenomena of elevation, xxxi, 365. ----, views on dislocations and fractures of the earth's surface, xxxiii, 83. Horns, manufactured articles from, xx, 394. Hornblende, localities of, in Connecticut, x, 14. ----, ----, in Massachusetts, vi, 226. ----, ----, in New Hampshire, vi, 245; xviii, 129. ----, ----, in New Jersey, v, 246; ix, 245. ----, ----, in New York, ix, 40, 41, 251; xix, 226; xxi, 324.^f ----, ----, in Pennsylvania, xiv, 4, 17. ----, ----, in R. Island, iv, 285. ---- rocks, of western Massachusetts, viii, 9. ---- slate, of the Connecticut valley, vi, 20. Horse, anecdote of, xlvi, 243. ----, a Filaria in the eye of, xxxix, 278.^f ----, fed with bread in Silesia, xi, 397. ----, fossil bones of, in Louisiana, _W. M. Carpenter_, xxxiv, 201.^f ----, power of, xxi, 167. Horse latitudes, xxxiii, 64. Horticultural experiments, _J. T. Plummer_, xl, 197. Horticulture, propagation of fruit trees and vines, xxvii, 288. Hospital of Mt. St. Bernard, v, 393. Hospitals in France, v, 191. ----, foundling, in Europe, xvii, 393. Hot blast, in the manufacture of iron, _T. Clark_, xxxi, 180. ---- ----, saving by, xxviii, 71. ---- springs or baths, see _Springs_. _Hough, H.G._, inquiries into the principles of liquid attraction, xvii, 86.^f _Houghton, D._, geology of Michigan, xxxiv, 190. ----, mining region of Michigan, xli, 183. Houses, improvements in laying out grounds, arranging and building, &c., _E. Lord_, xxv, 304. ----, double doors and double windows for, xxv, 294. ----, mode of heating, xxv, 295. ----, on securing from fire, _Lord Mahon's_ experiments, xxv, 290, 298; xxvi, 286. ----, ibid, _D. Hartley's_ experiments, xxv, 300. ----, mode of supplying cisterns with water for extinguishing fires, xxv, 301; xxvi, 293. Houstonia, notice of species of, x, 262, 263. _Howard, W._, description of a differential thermometer, ii, 327.^f ----, on the stopping of astronomical clocks, viii, 277. _Howe, S. G._, notices of ancient and modern Greece, xviii, 250. _Howell, S._, on the shad fisheries of the Delaware, xxxii, 134. Huaco, an Indian remedy for the hydrophobia, _W. R. Johnson_, xxiv, 279, 388. ----, _L. Feuchtwanger_, xxii, 182.