Life, antiquity on earth, xiii, 314; beginnings on earth, iii, 20, 173, 249, xv, 71; Bergson on, xvi, 196; brain in relation to, xi, 15; Brunonian (excitability) theory of, x, 89; cell basis of, ix, 17, x, 119, xii, 10, 14, xv, 16, 381; chemical nature of processes, viii, 353, 355; chemical theories of, x, 69, 84; colloidal theory, xii, 11-13; conditions necessary, ii, 242-5; conscious, parts concerned in, ix, 21-2; demand for, in nature, xiii, 69; dependence of, on sugar products, ix, 27; distinctions from inorganic realm, xii, 13-14; fundamental instincts, xi, 49-56; Hoffman's "ether" theory, x, 85; instinct for renewal, xiii, 116, 167; instinct of preservation of, x, 9-10, 282-3; interest and triteness, vi, 330; irritability theory of, x, 86, 87, 89; James on complexity of, 244; low temperature effects, i, 32; maintenance of, ix, 18-23; mechanical explanations of, x, 70, 71, 72; metals congenial to, viii, 148; nature of processes, ix, 34; necessity of water, xi, 66; only thing man cannot produce, vii, 310; origin, ii, 243, 245, xii, 9-13, xiii, 300-1; Paracelsus on process of, x, 49; possibility in other worlds, ii, 242-53; possibility on Mars, 228-32, 237-8; protoplasm the seat of, viii, 356, ix, 13, 17, x, 228, xiii, 74; recent lengthening in U. S., x, 291; salts in relation to, ix, 174-5; savage attitude toward, xv, 327; seat of, in body, ix, 11-12, 17; sea water favorable to, viii, 355; signs (proofs) of, ix, 9-17; soul as source of (Stahl), x, 84; spontaneous generation of, 139; temperature in relation to, ii, 249, v, 348, x, 250-1; universality, Indian belief, xvi, 44 (see also Vital Processes) Life Plant, xiii, 165 Lift, of aeroplanes, i, 288, 298 Lifting Magnets, iv, 289, vi, 86, 94 Lifting Pump, iv, 126 Lift Locks, of canals, v, 103 Ligaments, ix, 70-1 Ligatures, history of use of, x, 14, 27, 55-6, 91, 121-2, 123, 129-30, 146, 148