THE MECHANISM OF LIFE 



Parthenogenesis, artificial, 159 



Pascal's reed, 210 



Passage of nature, 230; its relativity 



to life, 232 

 Pasteurisation, 78 

 Paths in nervous system, 101, 147 

 Patterns of locomotion. 11 

 Pelvis, 17, 19 

 Pepsin, 58 

 Perception, 24, 222; and dissipation, 



of energy, 184; and indeterminism, 



181; kinds of, 178; nature of, 176; 



persistence of, 185; pure, 178; a 



sensori-motor process, 178 

 Personality, 234 

 Phagocytes, 69, 77 

 Photosynthesis, 82 

 Phototaxis, 136 

 Physico-chemistry of life, 214 

 Physiology an analysis, 164, 166; 



Cartesian, 192; and medicine, 166; 



the modern impasse, 193; and 



mind, 185 

 Pineal gland, 99 



Pituitary gland, 99; and goitre, 7 

 Planck, *162, 194 

 Plants, characters of, 8; and entropy, 



217; motions of, 9 

 Pleasure, analysis of, 226 

 Plexus, limb, 93; solar, 90 

 Poison glands, 12 

 Postures, animal, 11 

 Potential energy, 47 

 Prediction in science, 212; the test of 



theory, 173 



Preservation of meat, 78 

 Priestley, 157 



Probability and entropy, 203 

 Production by plants, 85 

 Proprioceptors, 121 

 Proteids, chemistry of, 59; foodstuffs, 



58; putrefaction of, 79; residues, 77 

 Psychoids, 215 

 Psycho-physics, 175 

 Ptyalin, 58 



Pulmonary circulation, 65 

 Putrefaction, 78 

 Pyramidal cells, 128 

 Pyramidal tracts, 104, 129; evolution 



of, 129 

 Pyramids, decussation of, 104 



Radicles, chemical, 59 



Radioactivity, 53, 86, 230 



Radium, 53 



Rankine, 194 



Rational dynamics, 46 



Reactions, coupled, 83 



Real and unreal existence, 179 



Reality and law of conservation, 53, 



215 



Reason, evolution of, 186 

 Receptors, 24; cold, 109; connections 



of, 102; distance, 24; equilibrium, 

 25, 109; gustatory, 25; heat, 25; 

 joints, 110; muscle, 110, 112, 119, 

 124; olfactory, 109; touch, 25; 

 vision, 107 



Reference, frames of, 189 



Reflex action and cerebellum, 120; 

 control of, 120; and cortex, 120; 

 craniospinal, 121; diagram, 117; 

 gustatory, 238; inhibition of, 138; 

 in normal animal, 138; olfactory, 

 238; predictable, 172; schematic, 

 120; simple, 120; scratch, 119 



Reflex arcs, diagram, 29, 120; units 

 of nervous system, 130 



Regulations of activities. 136 



Relations, 228 



Relativity, 235; and Descartes, 161; 

 and a finite universe, 197; and re- 

 versibility, 196 



Relays in nervous system, 100 



Representations, mental, 176 



Reproduction, 3 



Respiration, automatic, 87; and 

 carbonic acid, 87; gaseous inter- 

 change, 67; mechanism, 17, 65; 

 movements, 68; regulation, 87; 

 theory of, 157 



Responses, adaptive, 110; animal, 10, 

 13; and heredity, 150; indeter- 

 mined, 138, 175; and stimuli, 139; 

 unpredictable, 173 



Restlessness and decerebration, 141 



Retina, 107, 115 



Reversibility, physical, 43, 195 



Ribs, skeleton of, 16 



Rolandic fissure, 104 



Roots of plants, 9 



Rotifers, locomotion in, 11 



Rumford and heat, 157 



Russell, 185 



Rutherford, 53 



Salivary gland, 58 



Saltpetre, 79 



Saprozoic nutrition, 84 



Science, method of, 166, 170; and 



utility, 214 



Scratch reflex, 137, 138 

 Second law of thermodynamics, 194; 



reversal of, 198, 216 

 Secretion, Cartesian theory of, 155; 



chemistry of, 239; psychical, 239 

 Segments in nervous system, 92 

 Sensation, 24, 106, 222; and action, 



133; chemical, 108; complex, 116; 



disordered, 52; exteroceptive, 



general, 110; gustatory, 25; and 



knowledge, 133; muscular, 109; 



nature of, 174; olfactory, 108; 



paths of, 111; and perception, 175; 



phvsical, 176; proprioceptive, 24; 



tactile, 25; visual, 107; 



