_Johnson, W. R._, economy of fuel, in its domestic applications, xxiii, 318.^f ----, electricity, experiments in, xxv, 57. ----, heating power of various coals, xlix, 166, 310. ----, heat and vapor, inquiries respecting, xxi, 304. ----, method of determining and calculating the specific heats of certain solids, xxvii, 267. ----, huaco a remedy for hydrophobia, xxiv, 279, 388. ----, confirmatory notice of the medical virtues of guaco, xxvii, 171. ----, iron from the Adirondack iron works, experiments on two varieties, xxxvi, 94.^f ----, iron ore and coal of Pennsylvania, analyses of, xxxviii, 382. ----, on the coal field of Carbon creek, xxxix, 137. ----, iron spikes, experiments on the adhesion of, in different kinds of timber, xxxii, 34.^f ----, rotascope, description of, xxi, 265.^f ----, rotation of liquids of different specific gravities, placed upon each other, xxvii, 84.^f ----, on the rapid production of steam in contact with metals highly heated, xix, 292; xx, 308, 418. ----, action between water and hot iron, xxi, 71.^f ----, description of a steam pyrometer, xxii, 96.^f ----, the strength of cylindrical steam boilers, xxiii, 68. ----, notice of an ancient American utensil, xxiii, 65.^f _Johnston, J._, improved air pump, xxxiv, 86.^f ----, apparatus for solidifying carbonic acid, xxxviii, 297^f; xlii, 203. ----, new crystals of beryl, from Middlelown, xl, 401.^f ----, on a large crystal of columbite from Middletown, Ct., xxx, 387.^f ----, sketch of the early history of Count Rumford, xxxiii, 21. ----, on shrinkage marks in sandstone, xlv, 315. _Johnston, J. F. W._, blank form for statistical information on chemical education, xxxi, 414. ----, work by, on agriculture, noticed, xlii, 187. Joints in rocks, _W. W. Mather_, xli, 172. _Jones, A._, steamboats protected from lightning, xxii, 106. ----, on hail storms, xxiii, 35.^f _Jones, G._, on the use of anthracite in blacksmith shops, xviii, 303. ----, remarks on prairies, xxxiii, 226. ----, Naval Sketches, citation from, xvi, 168, 320.^f ----, excursion to Cairo, &c., xxxi, 412. _Jones, W. G._, description of a new compensating pendulum, xxxviii, 274.^f _Joslin, B. F._, on the atmospheric origin of the Aurora, xxx, 390; xxxv, 145. ----, polarity of crystals indicated by rotation, while forming, as seen under solar microscope, xxxv, 150. ----, on the tails of Halley's comet, xxxi, 142, 324. ----, electro-magnetic apparatus, xxi, 86.^f ----, on the causes of the earth's magnetism, xix, 398. ----, memoir on irradiation noticed, xxvii, 389. Journals of Science, remark on British and American, xxvi, 174. Journey, scientific, by _Seiber_, in Abyssinia, announced, iv, 383. Juncus cylindricus, xlii, 83. ---- Greenei, xlv, 37. Juniperus repens, iv, 69. Jussieua tenuifolia, v, 294. Justicia lætivirens, xlv, 176. K. Kaatskill mountains, see _Catskill_.