PIMENTA.
PIMPERNEL.
PINE-APPLE, sterility and variability of the.
PINK, Chinese.
PINKS, bud-variation in. -improvement of.
Pinus pumilio, mughus, and nana, varieties of P. sylvestris.
Pinus sylvestris. -hybrids of, with P. nigricans.
PIORRY, on hereditary disease.
Pistacia lentiscus.
Pistacia vera.
PISTILS, rudimentary, in cultivated plants.
Pistor, sterility of some mongrel pigeons. -fertility of pigeons.
Pisum arvense and sativum.
PITYRIASIS versicolor, inheritance of.
PLANCHON, G., on a fossil vine. -sterility of Jussiaea grandiflora in France.
PLANE-TREE, variety of the.
PLANTIGRADE carnivora, general sterility of the, in captivity.
PLANTS, progress of cultivation of. -cultivated, their geographical derivation. -crossing of. -comparative fertility of wild and cultivated. -self-impotent. -dimorphic and trimorphic. -sterility of, from changed conditions. -from contabescence of anthers. -from monstrosities. -from doubling of the flowers. -from seedless fruit. -from excessive development of vegetative organs. -influence of selection on. -variation by selection, in useful parts of. -variability of. -variability of, induced by crossing. -direct action of change of climate on. -change of period of vegetation in. -varieties of, suitable to different climates. -correlated variability of. -antiquity of races of.
PLASTICITY, inheritance of.
PLATEAU, F., on the vision of amphibious animals.
Platessa flesus.
PLATO, notice of selection in breeding dogs by.
PLICA polonica.
PLINY, on the crossing of shepherd dogs with the wolf. -on Pyrrhus' breed of cattle. -on the estimation of pigeons among the Romans. -pears described by.
PLUM. -stones figured. -varieties of the. -bud-variation in the. -peculiar disease of the. -flower-buds of, destroyed by bullfinches. -purple-fruited, liable to certain diseases.
PLUMAGE, inherited peculiarities of, in pigeons. -sexual peculiarities of, in fowls.
PLURALITY of races, Pouchet's views on.
Poa, seeds of, used as food. -species of, propagated by bulblets.
PODOLIAN cattle.
POINTERS, modification of. -crossed with the foxhound.
POIS sans parchemin.
POITEAU, origin of Cytisus adami. -origin of cultivated varieties of fruit-trees.
POLISH fowl. -skull figured. -section of skull figured. -development of protuberance of skull. -furculum figured.
POLISH, or Himalayan rabbit.
POLLEN. -action of. -injurious action of, in some orchids. -resistance of, to injurious treatment. -prepotency of.
POLLOCK, Sir F., transmission of variegated leaves in Ballota nigra. -on local tendency to variegation.
POLYANTHUS.
POLYDACTYLISM, inheritance of. -significance of.
PONIES, most frequent on islands and mountains. -Javanese.
POOLE, Col., on striped Indian horses. -on the young of Asinus indicus.
POPLAR, Lombardy.
POPPIG, on Cuban wild dogs.
POPPY, found in the Swiss lake-dwellings. -with the stamens converted into pistils. -differences of the, in different parts of India. -monstrous, fertility of. -black-seeded, antiquity of.
PORCUPINE, breeding of, in captivity.
PORCUPINE family.
Porphyrio, breeding of a species of, in captivity.
PORTAL, on a peculiar hereditary affection of the eye.
PORTO Santo, feral rabbits of.
Portulaca oleracea.
Potamochoerus penicillatus.
POTATO. -bud-variation by tubers in the. -graft-hybrid of, by union of half-tubers. -individual self-impotence in the. -sterility of. -advantage of change of soil to the.
POTATO, sweet, sterility of the, in China. -varieties of the, suited to different climates.
POUCHET, M., his views on plurality of races.
POUTER pigeons. -furculum figured. -history of.
POWIS, Lord, experiments in crossing humped and English cattle.
POYNTER, Mr., on a graft-hybrid rose.
PRAIRIE wolf.
PRECOCITY of highly-improved breeds.
PREPOTENCY of pollen.
PREPOTENCY of transmission of character. -in the Austrian emperors and some Roman families. -in cattle. -in sheep. -in cats. -in pigeons. -in fowls. -in plants. -in a variety of the pumpkin. -in the jackal over the dog. -in the ass over the horse. -in the pheasant over the fowl. -in the penguin duck over the Egyptian goose. -discussion of the phenomena of.