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.
401