5IO 



Index. 



375 ; on language and thought, 

 376 ; paraphrased, 4ti7 ; on 

 tnaterialism, 471 

 Murex, 292 



Mus rex and impfraior, 1 00 

 Musical and artistic faculty, 484 

 Mussel, freshwater, gills of, 4 ; 



olfactory organ of, 260 

 Mutilation, law of growth after, 

 126 ; not the best kind of evi- 

 dence of transmitted modifica- 

 tions, 162 



Naegeli, 159 



Naish, Mr. John G., on the 

 cockatoo, 354 



Natural selection, variation and, 

 61 ; two modes, elimination 

 and selection proper, 79 ; and 

 the effects of use and disuse, 

 174 ; not to be used as a magic 

 formula, 184 ; and instinct, 

 445 ; and human thought, 484 



Nerves, briefly described, 246; 

 afferent and eiferent, 303 



Nestor notabilis, 446 



Nests of bower-bird and hum- 

 ming-bird, 408 ; instinctive 

 building of, 453 



Nettleship, Mr., on a lion, 400 



Neural processes, environment 

 of, 491 



Neurosis and psychosis, 465 



Neuter insects, 440 



New Zealand sparrow, 445; 

 parrot, 446 ; chaffinch, 454 



Nichols, on taste, 251 



Noctule, 66 



NoiKK, on concepts, 325 



Nomada solidaginis, 90 



NoRRis, Mr. W. K., quoted, 420 



Noumena, or " things in them- 

 selves," 470 



Nucleus of animal cell, 10 ; as 

 controlling formative process 

 in, 124 



Nutrition in illustration of the 

 process of life, 25 



Object, nature of, 313, 437 



Ocelli in insects, 288 



Oecodoma cephalotes, 213 



Onchidium, 293 



Optogram, 276 



Organic combination, hypothesis 

 of, 150, 240 



Organic evolution, 177 ; as basis 

 of comparative psychology, 

 336 



Organic growth, 5 



Organism, unity of. as regards 

 body and germ, 161; relation 

 of, to environment. 183 



Organization, co-ordinating 



power of, 125 ; of bodily and 

 mental activities, 419 



Origin, distinguished from guid- 

 ance, 242 



Origin of species, 242 



Origin of oiganic variations, 231 ; 

 of metakinetic or mental varia- 

 tions, 496 



Ornithoptera, 179 



Otoliths, 265, 271 



Owen, Sir Richard, suggested 

 germinal conunuity, 135 j 



Oyster-embryo set free early, 56 ; 

 variation of Mediterranean. 164 



Pachyrhyncus orbifex, 87 



Pagurus prideauxii, 457 



Pain, massive and acute, 379 ; 

 capacities of animals for, 391 



Pangenesis, 182 



Panmixia and disuse, 189 



PapiUonid(B, 202 



Paradise, birds of, 202 



Paranucleus in protozoa, 39 



ParamcEcium, reproduction in, 39 



Parasites, how they feed, 5 



Parental sacrifice in birds and 

 mammals, 57 ; its iiniits, 186 



Parrot, intelligence of, 353 



Parthenogenetic forms, no 

 second polar cell in, 153 ; the 

 drone an exception, 153 



Parus palustris, 164 



Peal, Mr. S., on use of tools by 

 elephant, 370 



Peckham, Mr. G. W., on love- 

 antics of a spider, 208, 450 



Pecten, 293 



Pelagic atnmals, colours of, 83 



Penzoldt, Dr., on smell, 254 



Percept, 325, 326 



Perception, 311,324; in animals, 

 339 



Perceptual association, 202 



Perigenesis of the plastidule, 159 



Peripatus, 142 



Persistence, law of, 61 



Pheasant, hybrids between Am- 

 herst and golden, 106 ; golden, 

 hen with cock's plumage, 228 



Phenaodini, 223 



Phenomenal nature of object, 

 315, 320, 331 



Photographic psychology, 320, 

 326 



Phrynocephalus mystaceus, 90 



Physiological isolation, 104 



Physiological and psychological 

 activities, 304 ; series, 386, 41 7 



PiCTON, Mrs. K., on Skye terrier, 

 398 



Pigeons, correlated variations in. 

 216; silky fantail prepotent, 

 227 



Pigs, intestines of, 171 ; cross- 

 ing of, 226, 230 



Pike, teeth of, 437 



Pineal gland, 196, 288 



Pipistrelle, wing of, 64 



Pipits as illustrating divergence, 

 97 



Pitch, musical, 261 



Plasm, 10 



Plasmogen, 10 



Platyglossus, 83 



Play, instinct of, 450 



Pleasure and the special seniles, 

 243 ; massive and acute, 379 ; 

 capacities of animals for, 391 



Plecotus auritus, 68 



Plesiosiurus, pineal eye of, 288 



Ploss, Herr, on sex-differentia- 

 tion in man, 59 



Plov.r, Kentish, 83, 217 



Polar cells, extrusion of, 51 ; and 

 variation, 153 



Postponement of action, 385 



PocLioN, Mr. E. B., on colours 

 of animals, 84 ; on Phrynoce- 



phalus mystaceus, 90 ; on 

 caterpillars and chrysalids, 

 165 ; dimorphism in larva?, 

 18 7 ; observations on edibility 

 of caterpillars, 212; "Theories 

 of Heredity," qutotation from, 

 214; on the eating of un- 

 palatable insects, 445 



Predominant defined, 349 ; and 

 language, 374 



Preferential mating, a means of 

 segregation, 102 ; and sexual 

 selection, 197 



Preformation and evolution of 

 older writers, 50 



Prepotency, 227 



Presentations of sense, 318 



Previous sire, effect of, 1 68 



Prevision as a criterion of intel- 

 ligence, 457 



Principles, mechanical, 368 



Process of life, 20 



Progress, or continuous adapta- 

 tion, 119; .idaptation to more 

 complex circumstances, 183 



Pronghorn, curiosity in, 339 



Proposition, 329 



Protective resemblance and 

 mimicrj', 82; general resem- 

 blance, 83 ; variable resem- 

 blance, 84; special resem- 

 blance, 86 ; to another 

 organism, 87 ; coloration, a 

 me<ms of segregation, 101 



Protection, fosterage and, 219 



Proteus, sensitive to light, 294 



Protista, 15 



Protohippus, 118 



Protophyta, 15 



Protoplasm, 10 



Protozoa, nature of, 15 ; trans- 

 mission of acquired faculty in, 

 147 ; origin of nietazoan varia- 

 tions in, 156 ; psychology of, 

 360 



Psithyrus rupestris, 90 



Psychological and physiological 

 activities, 304 ; series, 386, 417 



Psychoses and neuroses, 465 



Ptarmigan, on colour of, 165 



Rabbit, brain of, 171 ; Angora 

 cro.ssed, 225 ; one-eared, 226 ; 

 deprived of long lip-haii s, 247 ; 

 papilla foliata of, 250 ; effects 

 of superabimdant food on, 394 



Rae, Dr., on dogs swimming 

 rivers, 364 ; on " abstract 

 reasoning " in the fox. 366 ; on 

 wild and tame ducklings, 435 



Rage and anger, 389 



Ramsay, Dr. Wm., on smell, 255 



Kats of Solomon Islands, 100; 

 of the London Docks, 106; at 

 South Kensington. 115 



Kayletgh, Lord, on colour-blend- 

 ing, 283 ; on sensitive-flame 

 experiments, 298 ; 



Reality, meaning of term, 314 



Reason distinguished from intel- 

 ligence. 330, 365; as defined 

 by .Mr. Romanes, 372 



Recepts, 326, 368 



! . ecognition-marks, 103 ; involve 

 perception, 351 



Reconstiucts and reconstruction 

 (mental;, 318 



