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.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
Swim-bladder
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 of
Timber-drift
Time, lapse of
Titmouse
Toads on islands
Tobacco, crossed varieties of
Tomes, Mr., on the distribution of bats
Transitions in varieties
Trees on islands belong to peculiar orders; with separated sexes
Trifolium pratense; incarnatum
Trigonia
Trilobites; sudden extinction of
Troglodytes
Tucutucu, blind
Tumbler pigeons, habits of, hereditary; young of
Turkey-cock, brush of hair on breast
Turkey, naked skin on head; young, wild
Turnip and cabbage, analogous variations of
Type, unity of
Types, succession of, in same areas
Udders enlarged by use; rudimentary
Ulex, young leaves of
Umbelliferae, outer and inner florets of
Unity of type
Use, effects of, under domestication
Utility, how far important in the construction of each part
Valenciennes on fresh-water fish
Variability of mongrels and hybrids
Variations appear at corresponding ages; analogous in distinct species
Varieties, natural; struggle between; domestic, extinction of;
transitional; when crossed, fertile; when crossed, sterile; classification
of
Verbascum, sterility of; varieties of, crossed
Verneuil, M. de, on the succession of species
Viola tricolor
Volcanic islands, denudation of
Vulture, naked skin on head
Wading-birds
Wallace, Mr., on origin of species; on law of geographical distribution; on
the Malay Archipelago
Wasp, sting of
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 Alpine plants; on rarity of
intermediate varieties
Weald, denudation of
Web of feet in water-birds
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, fossil
Wheat, varieties of
White Mountains, flora of
Wings, reduction of size
Wings 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 land-shells
in Madeira; on colours of insects on sea-shore; on wingless beetles; on
rarity of intermediate varieties; on insular insects; on land-shells of
Madeira, naturalised
Wolves, varieties of
Woodpecker, habits of; green colour of
Woodward, Mr., on the duration of specific forms; on the continuous
succession of genera; on the succession of types
World, species changing simultaneously throughout
Wrens, nest of
Youatt, Mr., on selection, on sub-breeds of sheep; on rudimentary horns in
young cattle
Zebra, stripes on
End of this Project Gutenberg Etext of the First Edition of On the Origin
of Species by Charles Darwin
The Origin of Species Page 53
