----, glass, method of dividing by friction, xiii, 7.^f ----, heat, on the cause of, iv, 142. ----, ----, capacities for, apparatus for illustrating, xiii, 6.^f ----, ----, ----, apparatus for showing an increase of, in air with relaxed pressure, xiii, 5.^f ----, ----, reply to _D. Olmsted_, on the materiality of, xii, 50, 366; xiii, 8. ----, liquids, apparatus for transferring or decanting, xxvi, 358.^f ----, hydrometers, xi, 115. ----, hydrostatic blowpipe, xi, 135.^f ----, laboratory of, xix, 26.^f ----, laudanum, xii, 291. ----, light, means of producing, ii, 172. ----, lightning rods, xiii, 322. ----, litrameter, xi, 133.^f ----, meconic acid, mode of obtaining, xii, 293. ----, matter is heavy as demonstrated by _W. Whewell_, reply to, xiii, 260. ----, nitrogen, apparatus for obtaining, from the atmosphere, xiv, 356^f; xxviii, 263.^f ----, nitrous oxide, properties of, xvi, 298. ----, ----, ----, method of obtaining, xvi, 295, 297.^f ----, palm-glass, cold produced by, xiii, 4.^f ----, olefiant gas, on the analysis of, xv, 270. ----, opium, mode of detecting minute quantities of, xii, 290. ----, platina, on the fusion of, xxxiii, 195; xxxv, 328. ----, pneumatic cistern, xiv, 200^f; xxxiii, 246.^f ----, potassium, improved process for, xxxviii, 338. ----, phosphorus, combustion of, in nitrous oxide, xxxii, 290.^f ----, prussic acid, apparatus for the evolution of, xxix, 244.^f ----, sassarubrin, a resin, xxxi, 285. ----, silicon, mode of obtaining, xxii, 189; xl, 28. ----, ----, apparatus for evolving from fluo-silicic acid, xxiv, 247.^f ----, silver, nitrate of, preparation of pure, v, 348. ----, on specific gravities, xi, 121.^f ----, storms of the Atlantic coast, v, 352. ----, ----, on Redfield's theory of, xlii, 140; xliii, 122. ----, ----, on Dové's essay on, xliv, 137; xlviii, 220. ----, ----, replies of _W. C. Redfield_ to, xlii, 299; xliii, 250^f; xliv, 384. ----, ----, or tornado in R. Island, Aug. 1838, and others, xxxviii, 73. ----, ----, tornado and water spout, causes of, xxxii, 153.^f ----, sulphurous acid, reaction of the essential oils with, xxxi, 281. ----, syphons, improved, xxiv, 317.^f ----, valve cock, xxiv, 251.^f ----, volumescope, description of, xv, 275^f; xxviii, 264.^f ----, ----, application of, xv, 278.^f ----, volumeter, xii, 38.^f ----, water, apparatus for decomposition and recomposition of, xxxviii, 336.^f ----, Woulfe's apparatus, a substitute for, i, 410^f; xiii, 1.^f