Lockyer, Sir Norman, discovery of sun prominences, ii, 181; collision theory, 327, 333; star classification, 309-10; on temple orientation, 26 Locomotion, forms of, ix, 82, 155-6; friction necessary to, iv, 94; of animals, means of, ix, 73-4; of serpents, xii, 212; reflex processes in, ix, 156-9; rolling, v, 215 Locomotives, Steam, v, 207-12, 377, 378-9; boilers, 140 (see Boilers); efficiency, 155; compared with electric, vii, 193-4; power source of, ix, 15; smoke from, i, 64, vii, 345; sound of passing, iv, 210 Locomotor Ataxia, ix, 90-1 Locusts, xii, 108-9; jaws of, 100; seventeen-year, 112, 113; as food, xv, 134 Locust Trees, in landscaping, xiii, 271-2; in Long Island, 354; in pea family, 198; lightning danger, i, 155; petals, 47; sleeping of leaves, 89, 113 Lodestone, iv, 52-3, 242, viii, 156; name of, iv, 243, (see also Loadstone) Lodge, Sir Oliver, Evesham experiments, vii, 352; on atmospheric electricity, 212; on electrons, vi, 114; on forces in atoms, 115; on luminiferous æther, 118; wireless system, xvi, 191 Lodgepole Pines, xiv, 374 Loess, i, 53-4, iii, 73-4, 380, xiv, 63, 72-5 Loire River, base-leveled stream, xiv, 49 London, "Black Day," ii, 211; eclipses in, 214; fogs, i, 94; harbor of, xiv, 270; sewage disposal, viii, 327; smoke deposits, i, 65; tea market of world, xiii, 231; water purification, viii, 319-20 London-Paris Air Route, i, 44-5, 95, 285-6 Long, Crawford W., x, 124, 125 Long Branch, N. J., wave destruction at, xiv, 45, 302 Long Distance Electrical Transmission, alternating and direct currents in, vi, 159-61, 195-6; choke coils in, vii, 50; condensers in, vi, 285-6; difficulties, 367; high voltages best, 159, 161, 163, 331-2; high voltages and leakage, vii, 10-11; of Niagara Power Plant, vi, 376-8; power-factor correction, 262; present distances attained, 365; progress in, vii, 9-10; synchronous condensers in, vi, 262; three phase alternators in, 206; transformers, 309, 324; transcontinental, 10, 367-8; vacuum tubes in, 125 Long Distance Telephony, inductance reduction, vii, 104-5; method of connecting cities, 104; phantom circuit, 105-6, 119; repeating stations, 114; in United States, 91-2 Longfellow, stanzas on nature, xvi, 43 Long Heads, physical characteristics, xv, 47; racial divisions, xvi, 48-9; skull index in, xv, 42 Long Island, bowlders on, xiv, 69; locust tree on, xiii, 354; opossums in, xii, 275; outwash plain on, iii, 69; plant conditions, xiii, 382; scallop fisheries, xii, 65; terminal moraine on, iii, 68, 237, 238 Long Island Sound, false corals of, xii, 47; oysters of, 61; oyster "drills" of, 72 Longitudinal Rivers, xiv, 153-4 Looking-glass, images in, iv, 335-6