Pheasant, young, wild, 216.
Philippi on tertiary species in Sicily, 312.
Pictet, Professor: on groups of species suddenly appearing, 302, 305. on rate of organic change, 313. on continuous succession of genera, 316. on close alliance of fossils in consecutive formations, 335. on embryological succession, 338.
Pierce, Mr., on varieties of wolves, 91.
Pigeons: with feathered feet and skin between toes, 12. breeds described, and origin of, 20. breeds of, how produced, 39, 42. tumbler, not being able to get out of egg, 87. reverting to blue colour, 160. instinct of tumbling, 214. carriers, killed by hawks, 362. young of, 445.
Pistil, rudimentary, 451.
Plants: poisonous, not affecting certain coloured animals, 12. selection applied to, 32. gradual improvement of, 37. not improved in barbarous countries, 38. destroyed by insects, 67. in midst of range, have to struggle with other plants, 77. nectar of, 92, fleshy, on sea-shores, 132. fresh-water, distribution of, 386. low in scale, widely distributed, 406.
Plumage, laws of change in sexes of birds, 89.
Plums in the United States, 85.
Pointer dog: origin of, 35. habits of, 213.
Poison not affecting certain coloured animals, 12.
Poison, similar effect of, on animals and plants, 484.
Pollen of fir-trees, 203,
Poole, Col., on striped hemionus, 163.
Potamogeton, 387.
Prestwich, Mr., on English and French eocene formations, 328.
Primrose, 49. sterility of, 247.
Primula, varieties of, 49.
Proteolepas, 148.
Proteus, 139.
Psychology, future progress of, 488.
Quagga, striped, 165.
Quince, grafts of, 261.
Rabbit, disposition of young, 215.
Races, domestic, characters of, 16.
Race-horses: Arab, 35. English, 356.
Ramond on plants of Pyrenees, 368.
Ramsay, Professor: on thickness of the British formations, 284. on faults, 285.
Ratio of increase, 63.
Rats: supplanting each other, 76. acclimatisation of, 141. blind in cave, 137.
Rattle-snake, 201.
Reason and instinct, 208.
Recapitulation, general, 459.
Reciprocity of crosses, 258.
Record, geological, imperfect, 279.
Rengger on flies destroying cattle, 72.
Reproduction, rate of, 63.
Resemblance to parents in mongrels and hybrids, 273.
Reversion: law of inheritance, 14. in pigeons to blue colour, 160.
Rhododendron, sterility of, 251.
Richard, Professor, on Aspicarpa, 417.
Richardson, Sir J.: on structure of squirrels, 180. on fishes of the southern hemisphere, 376.
Robinia, grafts of, 262.
Rodents, blind, 137.
Rudimentary organs, 450.
Rudiments important for classification, 416.
Sageret on grafts, 262.
Salmons, males fighting, and hooked jaws of, 88.
Salt-water, how far injurious to seeds, 358.
Saurophagus sulphuratus, 183.
Schiodte on blind insects, 138.
Schlegel on snakes, 144
Sea-water, how far injurious to seeds, 358.
Sebright, Sir J.: on crossed animals, 20. on selection of pigeons, 31.
Sedgwick, Professor, on groups of species suddenly appearing, 302.
Seedlings destroyed by insects, 67.
Seeds: nutriment in, 77. winged, 146. power of resisting salt-water, 358. in crops and intestines of birds, 361. eaten by fish, 362, 387. in mud, 386. hooked, on islands, 392.
Selection: of domestic products, 29. principle not of recent origin, 33. unconscious, 34. natural, 80. sexual, 87. natural, circumstances favourable to, 101,
Sexes, relations of, 87.
Sexual: characters variable, 156. selection, 87.
Sheep: Merino, their selection, 31. two sub-breeds unintentionally produced, 36. mountain, varieties of, 76.
Shells: colours of, 132. littoral, seldom embedded, 288. fresh-water, dispersal of, 385. of Madeira, 391, land, distribution of, 397.
Silene, fertility of crosses, 257.
Silliman, Professor, on blind rat, 137.
Skulls of young mammals, 197, 437.
Slave-making instinct, 219.
Smith, Col. Hamilton, on striped horses, 164.
Smith, Mr. Fred.: on slave-making ants, 219. on neuter ants, 239.
Smith, Mr., of Jordan Hill, on the degradation of coast-rocks, 283.