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Pistil, rudimentary

Plants, poisonous, not affecting certain coloured animals; selection applied to; gradual improvement of; not improved in barbarous countries; destroyed by insects ; in midst of range, have to struggle with other plants; nectar of; fleshy, on sea-shores; fresh-water, distribution of; low in scale, widely distributed

Plumage, laws of change in sexes of birds

Plums in the United States

Pointer dog, origin of; habits of

Poison not affecting certain coloured animals

Poison, similar effect of, on animals and plants

Pollen of fir-trees

Poole, Col., on striped hemionus

Prestwich, Mr., on English and French eocene formation

Primrose; sterility of

Primula, varieties of

Proteolepas

Proteus

Psychology, future progress of

Quagga, striped

Quince, grafts of

Rabbit, disposition of young

Race-horses, Arab; English

Races, domestic, characters of

Ramond on plants of Pyrenees

Ramsay, Prof., on thickness of the British formations; on faults

Ratio of increase

Rats, supplanting each other; acclimatisation of; blind in cave

Rattlesnake

Reason and instinct

Recapitulation, general

Reciprocity of crosses

Record, geological, imperfect

Rengger on flies destroying cattle

Resemblance to parents in mongrels and hybrids

Reversion, law of inheritance

Rhododendron, sterility of

Richard, Prof., on Aspicarpa

Richardson, Sir J., on structure of squirrels; on fishes of the southern hemisphere

Robinia, grafts of

Rodents, blind

Rudimentary organs

Rudiments important for classification

Sageret on grafts

Salmons, males fighting, and hooked jaws of

Salt-water, how far injurious to seeds

Saurophagus sulphuratus

Schiödte on blind insects

Schlegel on snakes

Sea-water, how far injurious to seeds

Sebright, Sir J., on crossed animals; on selection of pigeons

Sedgwick, Prof., on groups of species suddenly appearing

Seedlings destroyed by insects

Seeds, nutriment in; winged; power of resisting salt-water; in crops and intestines of birds ; eaten by fish; in mud; hooked, on islands

Selection of domestic products; principle not of recent origin; unconscious; natural; sexual ; natural, circumstances favourable to

Sexes, relations of

Sexual characters variable; selection

Sheep, Merino, their selection; two sub-breeds unintentionally produced; mountain, varieties of

Shells, colours of; littoral, seldom embedded; fresh-water, dispersal of; of Madeira; land, distribution of

Silene, fertility of crosses

Skulls of young mammals

Slave-making instinct

Smith, Col. Hamilton, on striped horses ; Mr. Fred., on slave-making ants ; on neuter ants; Mr., of Jordan Hill, on degradation of coast-rocks

Snapdragon

Somerville, Lord, on selection of sheep

Sorbus, grafts of

Spaniel, King Charles’s breed

Species ; groups of, suddenly appearing; beneath Silurian formations; successively appearing; changing simultaneously throughout the world

Spencer, Lord, on increase in size of cattle

Sphex, parasitic

Spiders, development of

Spitz-dog crossed with fox

Sports in plants

Sprengel.C., on crossing; on ray-florets

Squirrels, gradations in structure

Staffordshire, heath, changes in

Stag-beetles, fighting

Sterility from changed conditions of life ; of hybrids; laws of; causes of; from unfavourable conditions; of certain varieties .

St. Helena, productions of

St. Hilaire, Aug., on classification

St. John, Mr., on habits of cats

Sting of bee

Stocks, aboriginal, of domestic animal

Strata, thickness of, in Britain

Stripes of horses

Swallow, one species supplanting another

Swimbladder

Tail of giraffe; of aquatic animals ; rudimentary

Tarsi deficient

Tausch on umbelliferous flowers

Teeth and hair correlated; embryonic, traces of, in birds; rudimentary, in embryonic calf

Tegetmeier, Mr., on cells of bees

Temminck on distribution aiding classification

Thouin on grafts

Thrush, aquatic species of; mocking, of the Galapagos; young of, spotted; nest of

Thuret, M., on crossed fuci

Thwaites, Mr., on acclimatisation

Tierra del Fuego, dogs of; plants