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Trilobites, change of genera and species of. Trimen, on painting butterflies. Trimorphism, in plants. Trinidad, Catasetum of. -Cruger on caprification in. Triphaena (Triphoea) pronuba, robin attracted by colour of. Tristan d'Acunha, Carmichael on. -vegetation of. Triticum repens var. littorum, bloom-experiments on. Trollope, A., quotation by Darwin from. Tropaeolum, Darwin's experiments on. -peloric variety of. -waxy secretion on leaves. Tropical climate, in relation to colouring of insects. Tropical plants, possible existence during cooler period. -retreat of. Tropics, climatic changes in. -description of forests in. -similarity of orders in. Tubocytisus, Kerner on. Tuckwell, on the Oxford British Association meeting (1860). Tucotuco. Tuke, D.H., on influence of mind on body. -letter to. Tulips. Turkey, colour of wings, and courtship. -muscles of tail of. Turner, Sir W., Darwin receives assistance from. -on Darwin's methods of correspondence. -letters to. Turratella. Turtles, conversion into land-tortoises. Tussilago, Darwin on seeds of groundsel and. Twins, Galton's article on. Tylor, article in "Journal of the Royal Institution" by. -on "Early History of Mankind." Tyndall, lack of caution. -lecture by. -on the Alps. -review in the "Athenaeum" of. -on valleys due to glaciers. -work of. -dogmatism of. -on glaciers. -on Sorby's work on cleavage. -mentioned. Typhlops. Typical forms, difficult to select. -vagueness of phrase. Typotherium, Falconer on. Tyrol, Mojsisovics on the Dolomites of the. Umbelliferae, morphological characters of. -difference in seeds from the same flower. Undulation of light, comparison between Darwin's views and the theory of. Ungulates, development in N. America during Tertiary period. United States, flora of. -spread of Darwin's views in. Unity of coloration, Walsh on. Uredo, on Haematoxylon. Ursus arctos, Lamont on. -U. maritimus, Lamont on. Urticaceae. Uruguay. D'Urville, on Canary Islands. Use and disuse. -in plants. Uses, Natural Selection and. Uspallata. Utilitarianism, Darwin on. Utility and inheritance. Utopian "Flora," Darwin's idea of. Utricularia, Darwin's work on. -U. stellaris, Sir E. Tennent on. Vaginulus, Darwin finds new species of. Valeriana, two forms of. Valleys, acti
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