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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