The Variation of Animals and Plants under Domestication · Charles Darwin
PIMPERNEL, 19.
PINE-APPLE, sterility and variability of the, 22. PINK, Chinese, 25. PINKS, bud-variation in, 11; —improvement of, 20. _Pinus pumilio, mughus,_ and _nana,_ varieties of _P. sylvestris,_ 10. _Pinus sylvestris,_ 10, 24; —hybrids of, with _P. nigricans,_ 17. PIORRY, on hereditary disease, 12, 14. _Pistacia lentiscus,_ 23. _Pistacia vera,_ 11. PISTILS, rudimentary, in cultivated plants, 24. PISTOR, sterility of some mongrel pigeons, 6; —fertility of pigeons, 16. _Pisum arvense_ and _sativum,_ 9. PITYRIASIS versicolor, inheritance of, 14. PLANCHON, G., on a fossil vine, 10; —sterility of _Jussiæa grandiflora_ in France, 18. PLANE-TREE, variety of the, 10. PLANTIGRADE carnivora, general sterility of the, in captivity, 18. PLANTS, progress of cultivation of, 9 (2); —cultivated, their geographical derivation, 9; —crossing of, 15, 17; —comparative fertility of wild and cultivated, 16; —self-impotent, 17; —dimorphic and trimorphic, 17; —sterility of, from changed conditions, 18; —from contabescence of anthers, 18 (2); —from monstrosities, 9 (2); —from doubling of the flowers, 18 (2); —from seedless fruit, 18; —from excessive development of vegetative organs, 18; —influence of selection on, 20; —variation by selection, in useful parts of, 20; —variability of, 21; —variability of, induced by crossing, 22; —direct action of change of climate on, 23; —change of period of vegetation in, 24; —varieties of, suitable to different climates, 24; —correlated variability of, 25; —antiquity of races of, 28.
PLASTICITY, inheritance of, 21. PLATEAU, F., on the vision of amphibious animals, 20. _Platessa flesus,_ , 13. PLATO, notice of selection in breeding dogs by, 20. PLICA polonica, 23. PLINY, on the crossing of shepherd dogs with the wolf, 1; —on Pyrrhus’ breed of cattle, 20; —on the estimation of pigeons among the Romans, 6; —pears described by, 20. —stones figured, 10; —varieties of the, 10 (2), 20; —bud-variation in the, 11; —peculiar disease of the, 21; —flower-buds of, destroyed by bullfinches, 21; —purple-fruited, liable to certain diseases, 25. PLUMAGE, inherited peculiarities of, in pigeons, 5 (2); —sexual peculiarities of, in fowls, 7. PLURALITY of races, Pouchet’s views on, 1. _Poa,_ seeds of, used as food, 9; —species of, propagated by bulblets, 18. PODOLIAN cattle, 3. POINTERS, modification of, 1; —crossed with the foxhound, 3. POIS sans parchemin, 21. POITEAU, origin of _Cytisus adami,_ 11; —origin of cultivated varieties of fruit-trees, 22. POLISH fowl, 7 (6); —skull figured, 7; —section of skull figured, 7; —development of protuberance of skull, 7; —furculum figured, 7. POLISH, or Himalayan rabbit, 4. —action of, 16; —injurious action of, in some orchids, 17 (2); —resistance of, to injurious treatment, 18; —prepotency of, 19. POLLOCK, Sir F., transmission of variegated leaves in _Ballota nigra,_ 11; —on local tendency to variegation, 23. POLYDACTYLISM, inheritance of, 12; —significance of, 12.
PONIES, most frequent on islands and mountains, 2; —Javanese, 2. POOLE, Col., on striped Indian horses, 2 (2); —on the young of _Asinus indicus,_ 13. POPLAR, Lombardy, 10. PÖPPIG, on Cuban wild dogs, 1. POPPY, found in the Swiss lake-dwellings, 9 (2); —with the stamens converted into pistils, 10; —differences of the, in different parts of India, 18; —monstrous, fertility of, 18; —black-seeded, antiquity of, 28. PORCUPINE, breeding of, in captivity, 18. PORCUPINE family, 12, 14. _Porphyrio,_ breeding of a species of, in captivity, 18. PORTAL, on a peculiar hereditary affection of the eye, 12. PORTO Santo, feral rabbits of, 4. _Portulaca oleracea,_ 23. _Potamochoerus penicillatus,_ 18.
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