, 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.
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