matter as affected by, 39;
  not to be treated mathematically, 40;
  a slow explosion, 41, 42;
  an insoluble mystery, 43, 44;
  relations with the psychic and the inorganic, 44, 45;
  compared with fire, 54, 55;
  the final mystery of, 69, 70;
  vitalistic and mechanistic views, 71-114;
  Benjamin Moore’s view, 106-113;
  the theory of derivation from other spheres, 104;
  spontaneous generation, 105;
  plays a small part in the cosmic scheme, 115-119;
  mystery of, 120;
  nature merciless towards, 120-124;
  as an entity, 124-130;
  evanescent character, 131, 132;
  Prof.  Schaefer’s view, 133-138;
  intelligence the characteristic of, 134, 139, 151-154;
  power of adaptation, 147-149;
  versatility, 155, 156;
  the fields of science and philosophy in dealing with, 161-166, 173-176;
  simulation of, 167, 168;
  and protoplasm, 169;
  and the cell, 170;
  variability, 171, 172;
  the biogenetic law, 174;
  relation to energy, 177-183;
  an x-entity, 181, 182;
  struggle with environment, 185, 186;
  as a chemical phenomenon, 187;
  inadequacy of the mechanistic view, 212-243;
  degrees of, 216, 217;
  arises, not comes, 230;
  a metaphysical problem, 231;
  as a wave, 231;
  its adaptability, 253;
  a vitalistic view, 254-289;
  naturalness of, 263-268;
  advent and disappearance, 268, 269;
  the unscientific view, 274, 275;
  analogy with the question of perpetual motion, 277, 278;
  no great gulf between animate and inanimate, 285;
  a cosmic view, 289.
  See also Living thing, Vital force, Vitalism, Vitality.

Light, measuring its speed, 60.

Liquids, molecular behavior, 200.

Living thing, not a machine, 1-3, 212-214;
  viewed as a machine, 34-37, 224-228;
  a unit, 215;
  adaptation, 215, 216;
  contrasted and compared with a machine, 241, 242.

Lodge, Sir Oliver, 183, 197;
  his view of life, 17, 18, 34, 132, 161, 219, 237;
  his vein of mysticism, 34;
  on the ether, 62, 63, 66;
  on molecular spaces, 65;
  on radium, 201;
  on the atom, 203;
  on electrons, 203.

Loeb, Jacques, on mechanism, 10-13, 73;
  his experiments, 74, 76, 79, 147;
  on variations, 148.

Machines, Nature’s and man’s, 224-226;
   contrasted and compared with living bodies, 241, 242.

Maeterlinck, Maurice, on the Spirit of the Hive, 82.

Man, evolution of, 246-251;
  as the result of chance, 255;
  as a part of the natural order, 258, 259;
  his little day, 269.

Matter, as acted upon by life, 8, 9;
  creative energy immanent in, 9;
  change upon entry of life, 39;
  constitution of, 43, 44, 46-48;
  a state of the ether, 63;
  changes in, 131, 133;
  Emerson on, 188;
  discrete, 196;
  emanations detected by smell and taste, 198, 199;
  a hole in the ether, 203;
  origin of its properties, 204-206;
  a higher conception of, 259-261;
  common view of grossness of, 274, 275.