The Origin of Species by means of Natural Selection (6th ed) by Charles Darwin (ebook reader below 3000 .TXT) 📕

—instinct of tumbling

—young of

Pigs, black, not affected by the paint-root —modified by want of exercise

Pistil, rudimentary

Plants, poisonous, not affecting certain coloured animals —selection, applied to

—gradual improvement of

—not improved in barbarous countries

—dimorphic

—destroyed by insects

—in midst of range, have to struggle with other plants —nectar of

—fleshy, on seashores

—climbing

—fresh-water, distribution of

—low in scale, widely distributed

Pleuronectidae, their structure

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

—transported by various means

Pollinia, their development

Polyzoa, their avicularia

Poole, Col., on striped hemionus

Potemogeton

Pouchet, on the colours of flat-fish

Prestwich, Mr., on English and French eocene formations Proctotrupes

Proteolepas

Proteus

Psychology, future progress of

Pyrgoma, found in the chalk

Quagga, striped

Quatrefages, M., on hybrid moths

Quercus, variability of

Quince, grafts of

Rabbits, disposition of young

Races, domestic, characters of

Racehorses, Arab

—English

Radcliffe, Dr., the electrical organs of the torpedo Ramond, on plants of Pyrenees

Ramsay, Prof., on subaerial denudation

—on thickness of the British formations —on faults

Ramsay, Mr., on instincts of cuckoo

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

Reproduction, rate of

Resemblance, protective, of insects

—to parents in mongrels and hybrids

Reversion, law of inheritance

—in pigeons, to blue colour

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

Rogers, Prof., Map of N. America

Rudimentary organs

Rudiments important for classification

Rutimeyer, on Indian cattle

Sageret, on grafts

Salamandra atra

Saliva used in nests

Salmons, males fighting, and hooked jaws of Salt-water, how far injurious to seeds

—not destructive to land-shells

Salter, Mr., on early death of hybrid embryos Salvin, Mr., on the beaks of ducks

Saurophagus sulphuratus

Schacht, Prof., on Phyllotaxy

Schiodte, on blind insects

—on flat-fish

Schlegel, on snakes

Schobl, Dr., on the ears of mice

Scott, Mr. J., on the self-sterility of orchids —on the crossing of varieties of verbascum Sea-water, how far injurious to seeds

—not destructive to land-shells

Sebright, Sir J., on crossed animals

Sedgwick, Prof., on groups of species suddenly appearing Seedlings destroyed by insects

Seeds, nutriment in

—winged

—means of dissemination

—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

—objections to term

—natural, has not induced sterility

Sexes, relations of

Sexual characters variable

—selection

Sheep, Merino, their selection

—two sub-breeds, unintentionally produced —mountain, varieties of

Shells, colours of, littoral

—hinges of

—seldom embedded

Shells, fresh-water, long retain the same forms —fresh-water, dispersal of

—of Madeira

—land, distribution of

—land, resisting salt water

Shrew-mouse

Silene, infertility of crosses

Silliman, Prof., on blind rat

Sirenia, their affinities

Sitaris, metamorphosis of

Skulls of young mammals

Slave-making instinct

Smith, Col. Hamilton, on striped horses

Smith, Dr., on the Polyzoa

Smith, Mr. Fred., on slave-making ants

—on neuter ants

Snake with tooth for cutting through egg-shell Somerville, Lord, on selection of sheep

Sorbus, grafts of

Sorex

Spaniel, King Charles’ breed

Specialisation of organs

Species, polymorphic

—dominant

—common, variable

—in large genera variable

—groups of, suddenly appearing

—beneath Silurian formations

—successively appearing

—changing simultaneously throughout the world Spencer, Lord, on increase in size of cattle Spencer, Mr. Herbert, on the first steps in differentiation —on the tendency to an equilibrium in all forces Sphex, parasitic

Spiders, development of

Sports in plants

Sprengel, C.C., on crossing

—on ray-florets

Squalodon

Squirrels, gradations in structure

Staffordshire, heath, changes in

Stag-beetles, fighting

Star fishes, eyes of

—their pedicellariae

Sterility from changed conditions of life —of hybrids

—laws of

—causes of

—from unfavourable conditions

—not induced through natural selection

St. Helena, productions of

St. Hilaire, Aug., on variability of certain plants —on classification

St. John, Mr., on habits of cats

Sting of bee

Stocks, aboriginal, of domestic animals

Strata, thickness of, in Britain

Stripes on horses

Structure, degrees of utility of

Struggle for existence

Succession, geological

—of types in same areas

Swallow, one species supplanting another Swaysland, Mr., on earth adhering to the feet of migratory birds Swifts, nests of

Swim-bladder

Switzerland, lake inhabitants of

System, natural

Tail of giraffe

—of aquatic animals

—prehensile

—rudimentary

Tanais, dimorphic

Tarsi deficient

Tausch, Dr., on umbelliferae

Teeth and hair correlated

—rudimentary, in embryonic calf

Tegetmeier, Mr., on cells of bees

Temminck, on distribution aiding classification Tendrils, their development

Thompson, Sir W., on the age of the habitable world —on the consolidation of the crust of the earth 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

Thylacinus

Tierra del Fuego, dogs of

—plants of

Timber-drift

Time, lapse of

—by itself not causing modification

Titmouse

Toads on islands

Tobacco, crossed varieties of

Tomes, Mr., on the distribution of bats

Transitions in varieties rare

Traquair, Dr., on flat-fish

Trautschold, on intermediate varieties

Trees on islands belong to peculiar orders —with separated sexes

Trifolium pratense

—incarnatum

Trigonia

Trilobites

—sudden extinction of

Trimen, Mr., on imitating-insects

Trimorphism in plants

Troglodytes

Tuco-tuco, blind

Tumbler pigeons, habits of, hereditary

—young of

Turkey-cock, tuft of hair on breast

Turkey, naked skin on head

—young of, instinctively wild

Turnip and cabbage, analogous variations of Type, unity of

Types, succession of, in same areas

Typotherium

Udders enlarged by use

—rudimentary

Ulex, young leaves of

Umbelliferae, flowers and seeds of

—outer and inner florets of

Unity of type

Uria lacrymans

Use, effects of

—under domestication

—in a state of nature

Utility, how far important in the construction of each part Valenciennes, on fresh-water fish

Variability of mongrels and hybrids

Variation, under domestication

—caused by reproductive system being affected by conditions of life —under nature

—laws of

—correlated

Variations appear at corresponding ages

—analogous in distinct species

Varieties, natural

—struggle between

—domestic, extinction of

—transitional, rarity of

Varieties, when crossed

—fertile

—sterile

—classification of

Verbascum, sterility of

—varieties of, crossed

Verlot, M., on double stocks

Verneuil, M. de, on the succession of species Vibracula of the Polyzoa

Viola, small imperfect flowers of

—tricolor

Virchow, on the structure of the crystalline lens Virginia, pigs of

Volcanic islands, denudation of

Vulture, naked skin on head

Wading-birds

Wagner, Dr., on Cecidomyia

Wagner, Moritz, on the importance of isolation Wallace, Mr., on origin of species

—on the limit of variation under domestication —on dimorphic lepidoptera

—on races in the Malay Archipelago

—on the improvement of the eye

—on the walking-stick insect

—on laws of geographical distribution

—on the Malay Archipelago

—on mimetic animals

Walsh, Mr. B.D., on phytophagic forms

—on equal variability

Water, fresh, productions of

Water-hen

Waterhouse, Mr., on Australian marsupials —on greatly developed parts being variable —on the cells of bees

—on general affinities

Water-ouzel

Watson, Mr. H.C., on range of varieties of British plants —on acclimatisation

—on flora of Azores

—on rarity of intermediate varieties

—on Alpine plants

—on convergence

—on the indefinite multiplication of species Weale, Mr., on locusts transporting seeds Web of feet in water-birds

Weismann, Prof., on the causes of variability —on rudimentary organs

West Indian islands, mammals of

Westwood, on species in large genera being closely allied to others —on the tarsi of Engidae

—on the antennae of hymenopterous insects Whales

Wheat, varieties of

White Mountains, flora of

Whittaker, Mr., on lines of escarpment

Wichura, Max, on hybrids

Wings, reduction of size

—of insects homologous with branchiae

—rudimentary, in insects

Wolf crossed with dog

—of Falkland Isles

Wollaston, Mr., on varieties of insects

—on fossil varieties of shells in Madeira Wollaston, Mr., on colours of insects on seashore —on wingless beetles

—on rarity of intermediate varieties

—on insular insects

—on land-shells of Madeira naturalised

Wolves, varieties of

Woodcock with earth attached to leg

Woodpecker, habits of

—green colour of

Woodward, Mr., on the duration of specific forms —on Pyrgoma

—on the continuous succession of genera —on the succession of types

World, species changing simultaneously throughout Wright, Mr. Chauncey, on the giraffe

—on abrupt modifications

Wrens, nest of

Wyman, Prof., on correlation of colour and effects of poison —on the cells of the bee

Youatt, Mr., on selection

—on sub-breeds of sheep

—on rudimentary horns in young cattle

Zanthoxylon

Zebra, stripes on

Zeuglodons

End of Project Gutenberg Etext Origin of Species, 6th Edition, by Darwin