Lyra, elliptic nebulæ in, ii, 360; movement of sun toward, 18, 122, 137, 305-6 Lyric Poetry, primitive, xv, 319-21 Lysins, x, 211 Maas River, shifts in delta, xiv, 186 (see also Meuse) Macaques, xii, 378-9 Macaws, xii, 266 McCormick, Cyrus, reaper, v, 244-7, 249, 379 MacCulloch, on rocks, xvi, 170 McDowell, Ephraim, x, 122, 147 Mace, spice, xiii, 261, 262 Mace, symbol of power, xv, 208 McGehee, Arkansas, antimalarial work in, x, 174 Machine Guns, v, 362-8, 380, 382 Machines, advantages of electrical drive, vii, 62; air-cushioning in, v, 134; "animated," 326-44; contract with operators, vii, 121-2; displacement of men by, v, 17-18; early, iv, 26; efficiency (see Efficiency of Machines), elementary, iv, 89-94, v, 20-41; fascination of, vi, 175; force and resistance law, iv, 90, 92; for making machines, v, 42-56; friction in, iv, 92-4; history of development, v, 15-19, 376-84; hydraulic, reliability, 106; instruction of workers, xi, 363-5; labor-saving, vii, 73; mechanical advantage, iv, 89, 98; parts named from human parts, v, 20; skilled artisans and, 42, 46; standardization of parts, 48-50, 53-4; summary of progress in, 376-84 Machine Tools, development, v, 42-56, 376; in relation to automobile industry, 55-6, 214, 383 Mackerel Sky, i, 100, 376 Mackerel Year, i, 359 Mackintosh Waterproof Cloth, xiii, 245 Madagascar, chameleons of, xii, 210; crocodiles of, 199; former union with Africa, 376; fossane of, 353; lemurs of, 374, 375; laceleaf yam, xiii, 89-90; orchid, 48; ratite birds in, xii, 249; separation from Africa, xiv, 273; tenrecs of, xii, 367; tortoises of, 191, 192 Madder Family, xiii, 205-6 Madeira, discovery of, xiv, 309; oceanic volcano, 289, 316 Madrepores, xii, 39-40 Maeterlinck, on eelgrass, xiii, 150-1 Magazines, printing and binding, v, 305-7 Magdalenian Period, xv, 105, 109; clay models of, 118-19 Magdeburg Hemispheres, iv, 29 Magellanic Clouds, ii, 355 Magendie, François, x, 126, 127, xvi, 186 Maggiore Lake, iii, 146 Magi, Persian, xvi, 59 Magic, history of, xvi, 44, 59 Magic Lantern, iv, 341-2 Magma, viii, 191 Magnesium, viii, 17, 127, 148-9, 153; affinity intensity, 128; atomic weight and symbol, 383; automobile parts made of, 127, 149; electrolytic production, vii, 320-1; fusibility, viii, 384; ignition, 53, 54; in body, 354; in body fluids, ix, 174; in earth's crust, iii, 308, viii, 19, 129, 192, 195, 196; light of, 60, 172; plant needs of, 337, 341; specific gravity, 384; test for, 287, 289 Magnesium Chloride, in sea water, xiv, 295-6 Magnesium Compounds, viii, 130, 148-9; deposits of, 138, 195, 196, 275; in hard water, 40, 318, 322-4; lightness of, 29 Magnesium Oxide, medicinal uses, viii, 153