Psychology, 196, 197, 198, 204, 205, 208, 211, 235, 236, 361; alone competent to pronounce origin of man, 196; as science of behavior, 198; human, 235; positive, 361; reveals psychic activities as modification of abiding ego, 205; sole science that studies man on his distinctively human side, 196; vulgar, 236; without a soul, 208, 236 Psychophysical, 198, 206, 236; dualism, 198; parallelism, 206, 236 Psychosis, 213, 235, 255, organic, 213, 235 —has for agent and recipient the psycho-organic composite, 213; psycho-organic, 255 Physiological process not reducible to mere physicochemical reaction, 199 Potency, 199 Purpose, 11, 249, 255, 258, 259, 298; Divine, 249; unconscious of, 255, 259 Purposiveness, 248, 249, 262; no intelligence, 262; objective, 248, 249; unconscious, 248 Quadrumana, 296 Qasr-el-Sagha, 115 Quaternary, 98, 319; Early, 319 Races, 334, 342 Radiation, pressure of, 183 Radioactive elements, 56 Radio-activity, 118 Radiolaria, 118 Radiometer, 183 Radius, shows curvature, 327 Ragweed, 16 Raft of Red River, 154 Random Assortment, 27, 42; of chromosomes, 27 Ratio, body-brain, 317 Rays, 119 Reactants, 209 Reaction, 243, 252; elementary, motor, 252; historical basis of 243 Reaction-systems, 26, 204 Reason, 235, 240, 244, 245, 259, 267, 343; not evolved, 267; sole means of human preservation, 343; superorganic power of, 244, 245 Reasoning, 207, 220 Recapitulation, 48, 275, 278, 279, 285; embryonic, 48, 275, 278, 279 Receptors, 57, 213, 222; extended, necessary to perceive material stimuli, 222 Recessive chin, 311 Recognition, 207 Recombination, 27, 42; chromosomal, 27; factorial, 27 Reconstructions, 89, 90, 92, 321; of fossil skulls, 321; psychological motivation of, 89, 90; scientific, 89, 90, 92 Recuperation, autonomous, 163 “Recurrent faunas,” 110 Reduction, 42, 157 Reflection, 224, 225, 226, 240, 256; a fact, 225, 226; alleged impossibility of, 225; only possible to spiritual agent, 224; undeniable fact of, 225 Reflexes, innate and conditioned, 238 Reflexion, 225 Reflexive orientation, 174, 176; of energies, no living being, 176; of forces in living organism, 174; in living being, 201 Regression of organ, 305 Regulation, 253; intelligent, 253; sensory, 253 Rejuvenation, 155, 161, 163; three kinds of, 161 Rejuvenescence, 160, 161, 162 Reign of Terror, 357; French, 357; Russian, 357 Reindeer, 332 Re-integration of atoms, impossible, 163 Relationships, 254; causal and telic, 254; supersensible, 254