INDEX 



247 



Sense organs, stimulation of, 24, 107; 

 accessory, 108 



Sensibility, general, 1 1 1 



Sensoii- motor activity, 28 ; mechanism, 

 117; system, 13, 145; 



Sensory mechanisms, 24 



Servetus, 66 



Sherrington, 165 



Shock, nervous, 142 



Skeleton, 152; absence of, 15; analysis 

 of, 19; axial, 16; of birds, 16; con- 

 nections of, 14; in Crustacea, 15; 

 internal, 15; joints in, 16; and 

 mechanics, 14; of moUusca, 14; 

 muscles and, 20; plan of, 13; size 

 of, 16; of snakes, 16; of sponges, 14 



Skull, structure of, 16 



Smell, 33; associations of, 114; deli- 

 cacy of, 109; sensation of, 113 



Snaring devices, 12; 



Social complexes, 7 



Socialisation of activities, 7 



Solar radiation, 69, 86 



Soul, rational, 154; sensitive, 192 



Sound, analysis of, 116; waves, 168 



Space, abstract, 191; Euclidean, 189; 

 a form of sensibility, 191; measure- 

 ment of, 169; non-Euclidean, 235 



Space time, 228, 235 



Spermatozoa, 11 



Spinal animal, 118 



Spinal cord, 92, 93; autonomy of, 94; 

 connections of, 110 



Spinal frog, 136, 172 



Spinal nerves, 93; roots of, 93, 165; 

 sensory. 111 



Spinal reflex, 136, 137 



Spontaneous actions, 105 



Spooks and energy, 52 



Spirits, animal, 155; natural, 154 



Spiritualism, 193 



Starch in foods, 60; in plants, 83 



State and organism, 75 



Statistical and individual concepts, 

 212 



Steam engine, 42, 55 



Stearic acid, 60 



Sterilisation, 78, 79 



Stimuli of environment, 13; intrinsic, 

 140; physical, 13; and sensation, 106 



Stimulus and response, model of, 132, 

 134 



Structure of animals, 2; Descartes' 

 analysis of, 156; and function, 3; 

 modifications of, 12 



Sweating, regulation of, 88 



Swimmerets in Crustacea, 18 



Swimming, 11 



Subjectivity, 53, 176 



Submaxillary gland, 237 



Sugars, chemistry of, 60 



Suggestion, mass, 180 



Sunlight, energy of, 218 



Sympathetic nervous system, 88, 90, 



165 

 Synapses, 27 

 Syntheses, organic, 159 

 Systems, physical, 45 



Taste, 33, 108 



Taxis in animals, 135 



Techniques, origin of, 182 



Telepathy, 225 



Temperature, 31 



Tendencies, logical, 216 



Tendons, 21 



Texture, 32 



Theory, astronomical, 210 



Thermodj'namics, 194; history of, 157; 



laws of, 52; and life, 69; and 



mechanism, 69 

 Thinking and action, 188 

 Thomson, Sir J. J., 53, 194 

 Thomson, Sir W., 203 

 Thorax, movements of, 17 

 Threshold of sensation, 106 

 Thumb, mobility of, 19 

 Time, astronomical, 191 ; dimension, 



236; measurement of, 191, 206; 



a reversible series, 196 

 Touch organs, 118 

 Toxins of bacteria, 77 

 Tracts, nervous, 99 

 Transformations, releasing, 48 

 Transformism, 234 

 Trial and error, 188 

 Tropisms, 9, 13, 135, 180 

 Trypsin, 58 



Unavailable energy, 42 



Universe, condition of, 97; cycles in, 

 205; dimensions of, 204; and dissi- 

 pation, 204; finite, 197, 236; in 

 passage, 231; running down, 208; 

 structure of, 162 



Urea, chemistry of, 59; excretion of, 

 70, 76; nitrification of, 84 



Urine, 73 



Variability and determinism, 181 

 Variations, organic, 181 

 Vascular system, 152 

 Vegetative processes, 217 

 Veins, 63 



Ventricles of brain, 97 

 Vertebrae, articulations of, 16 

 Vertebrates, locomotion of, 2; skele- 

 ton of, 17 

 Vestal virgins, 215 

 Vestibular sensation, 114, 124 

 Vicarious functioning, 144 

 Vision, organs of, 108 

 Vis viva, 55 



Vital impetus, 223, 225 

 Vivisection, 160 



