rudimentary, in embryonic calf, 450, 480.
Tegetmeier, Mr., on cells of bees, 228, 233.
Temminck on distribution aiding classification, 419.
Thouin on grafts, 262.
Thrush:
aquatic species of, 185.
mocking, of the Galapagos, 402.
young of, spotted, 439.
nest of, 243.
Thuret, M., on crossed fuci, 258.
Thwaites, Mr., on acclimatisation, 140.
Tierra del Fuego:
dogs of, 215.
plants of, 374, 378.
Timber-drift, 360.
Time, lapse of, 282.
Titmouse, 183.
Toads on islands, 393.
Tobacco, crossed varieties of, 271.
Tomes, Mr., on the distribution of bats, 394.
Transitions in varieties rare, 172.
Trees:
on islands belong to peculiar orders, 392.
with separated sexes, 99.
Trifolium pratense, 73, 94.
Trifolium incarnatum, 94.
Trigonia, 321.
Trilobites, 306.
sudden extinction of, 321,
Troglodytes, 243.
Tucutucu, blind, 137.
Tumbler pigeons:
habits of, hereditary, 214.
young of, 446,
Turkey-cock, brush of hair on breast, 90.
Turkey:
naked skin on head, 197.
young, wild, 216.
Turnip and cabbage, analogous variations of, 159.
Type, unity of, 206.
Types, succession of, in same areas, 338.
Udders:
enlarged by use, 11.
rudimentary, 451.
Ulex, young leaves of, 439.
Umbelliferae, outer and inner florets of, 144.
Unity of type, 206.
Use:
effects of, under domestication, 11.
effects of, in a state of nature, 134.
Utility, how far important in the construction of each part, 199.
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