Matter, chemical energy of, viii, 267; chemistry, science of, 11, iv, 12; constitution of, 21, 23, vi, 35-6, 78, 108, 109-12, viii, 22-8 (see also Atomic Theory, Electron Theory, Molecular Theory); elasticity of, iv, 35-6; elements of, viii, 11-12, 16-21; energy and, iv, 12, 13-14; energies in, xvi, 15; energy loss, 134; ether in, iv, 181; fluxation idea, xvi, 194; fourth state of, iv, 54-5, xvi, 193; Greek theories, 77, 83-4, 86, 91, 118; indestructibility, vi, 128, viii, 110; inertia of, iv, 20; kinetic theory of, 30, 131; monad theory, xvi, 117-18; primary concept, iv, 15, 16; sciences of, xvi, 36-7; states of, iv, 21-3 (see also Physical States) Matterhorn, formation of, iii, 236 Matriarchy, xv, 295 Maudsley, Henry, inventions, v, 45-6, 99, 376 Mauna Loa, iii, 103-4, 107, xiv, 322-3; real height and diameter, 101, 225 Maury, Lieut. M. F., i, 216, 271-2, xiv, 288 Maxim Machine Gun, v, 363, 364, 382 Maxwell, Clerk, electromagnetic theory, iv, 54, 55, vi, 25, vii, 371; on loss of molecular energy, xvi, 134; on motor-dynamo discovery, iv, 54; on rings of Saturn, ii, 133, 265-6; prediction of electromagnetic radiations, xvi, 191 Mayans, number and time systems of, xv, 181, 182 (fig.) May Bugs, xii, 123 Mayflies, xii, 104 Mazama, xii, 325 Mazda Lamps, vi, 267, 268; ohms of, 75; sizes and light, vii, 153 Mazda Nitrogen Lamps, vi, 278 Meadow Pink, xiii, 133-5 Meals, agreeable surroundings, at, ix, 241, x, 319-20; alcohol at, ix, 244; bathing after, 313; eating between, 88; excitement at, xi, 374-5; soup value at, ix, 241, x, 320; water at, ix, 229 Meanders, iii, 380; in old and new areas, 33, 34, xiv, 162, 165; intrenched, 165 Measles, Brown's treatment of, x, 89; consumption and, 292; eardrum affected by, ix, 103; epidemic of 15th century, x, 59-60; first description of, 32; germ of, 200; Indian susceptibility to, xv, 48, 51 Measurements, British and metric systems, iv, 45-6, 69-70, viii, 27-8; chemical apparatus, 294, 295 (fig.); in different fields, vii, 151-2; sciences and standards of, xvi, 129-31 Meat, body heat production by, ix, 309, x, 271, 273; calories in, 269; calory loss in preparing, ix, 299; composition, viii, 362; cooking effects, 368; digestion of, x, 326; eating of, effects, ix, 384-6, x, 279; eating of, in relation to bile, ix, 275; food constituents in, 300; gristle of, 13; proteins in, 34, 35, 280; salted, tinned and dried, x, 263; salts and extracts of, viii, 366; structure of lean and coarse, ix, 75; vitamines in, x, 260, 261, 262, 266 Mechanical Advantage, iv, 89, 92, 93 Mechanical Equivalent of Heat, iv, 49-50, 140, 142, 189-90, v, 350-1, viii, 186-7, xvi, 131-3 Mechanical Progress, summary, v, 376-84