Animal Life and Intelligence

by C. Lloyd Morgan

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• Pachyrhyncus orbifex, [87]
• Pagurus prideauxii, [457]
• Pain, massive and acute, [379];
  • capacities of animals for, [391]
• Pangenesis, [182]
• Panmixia and disuse, [189]
• Papilionidæ, [202]
• Paradise, birds of, [202]
• Paranucleus in protozoa, [39]
• Paramœcium, reproduction in, [39]
• Parasites, how they feed, [5]
• Parental sacrifice in birds and mammals, [57];
  • its limits, [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 animals, 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 Amherst and golden, [106];
  • golden, hen with cock's plumage, [228]
• Phengodini, [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], [417]
• Picton, Mrs. E., on Skye terrier, [398]
• Pigeons, correlated variations in, [216];
  • silky fantail prepotent, [227]
• Pigs, intestines of, [171];
  • crossing 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 senses, [243];
  • massive and acute, [379];
  • capacities of animals for, [391]
• Plecotus auritus, [68]
• Plesiosaurus, pineal eye of, [288]
• Ploss, Herr, on sex-differentiation in man, [59]
• Plover, Kentish, [83], [217]
• Polar cells, extrusion of, [51];
  • and variation, [153]
• Postponement of action, [385]
• Poulton, Mr. E. B., on colours of animals, [84];
  • on Phrynocephalus mystaceus, [90];
  • on caterpillars and chrysalids, [165];
  • dimorphism in larvæ, [187];
  • observations on edibility of caterpillars, [212];
  • "Theories of Heredity," quotation from, [214];
  • on the eating of unpalatable 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, [168]
• Prevision as a criterion of intelligence, [457]
• Principles, mechanical, [368]
• Process of life, [20]
• Progress, or continuous adaptation, [119];
  • adaptation to more complex circumstances, [183]
• Pronghorn, curiosity in, [339]
• Proposition, [329]
• Protective resemblance and mimicry, [82];
  • general resemblance, [83];
  • variable resemblance, [84];
  • special resemblance, [86];
  • to another organism, [87];
  • coloration, a means of segregation, [101]
• Protection, fosterage and, [219]
• Proteus, sensitive to light, [294]
• Protista, [15]
• Protohippus, [118]
• Protophyta, [15]
• Protoplasm, [10]
• Protozoa, nature of, [15];
  • transmission of acquired faculty in, [147];
  • origin of metazoan variations 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]