T _Tachycineta leucorrhoa_, 361 _Tadorna cornuta_, 129 _T. tadornoides_, 129 Tails, 62, 64 Tait, Mr, 356 Tanager, 281 Tapir, 42 Tasmanian devil, 282 Teal, 290, 316 Teasel, fuller’s, 58 Teeth, molar, 105 Tegetmeier, Mr, 307 Tern, 62, 278 _Terpsiphone paradisi_, 202, 298, 304, 316, 324 _Tetraogallus_, 337 _Tetraonidæ_, 125 _Tetrapteryx paradisea_, 249 _Tetrao tetrix_, 129 _T. urogallus_, 129 _Thamnobia cambayensis_, 202, 275 _T. fulicata_, 202, 378 Thayer, Mr Abbot, 184-7 Thompson, Seton, 354 Thomson, 103, 136, 145, 166, 306, 326, 340 Throat disease, 353 “Through Southern Mexico,” 197, 245 “Through the Heart of Patagonia,” 359 Thrush, 203, 207, 355 Tiger, 334 Tit, 245 Toad, 210, 219, 241 Toad-flax, 56 Tortoise, 222 Trefoil, 274 _Trochilium_, 229 Trogon, 62 _Tropidonotus piscator_, 220 Troupial, 244, 281, 284 Tsetse-fly, 352 _Tupaia_, 180, 216 _T. ellioti_, 216 Turbit, 72, 91-3 “Turbit, The Modern,” 91 Turkey, 95, 363 Turnspit dog, 59 _Turtur cambayensis_, 333 _T. suratensis_, 333 _T. risorius_, 33, 123, 126 Tylor, Mr Alfred, 287 U Ungulates, 67 Unilateral transmission, 341 Unit characters, 148-52 _Uria grylle_, 245 _U. lacrymans_, 58 Urial, 120, 130, 131 _Urodynamis tritensis_, 243 V Valezina, 103 _Vanessa levana_, 154 _V. prorsa_, 154 Vapourer moth, 215 Variation, 52-110 —— cause of, 59-60 —— continuous, 56, 69, 76, 105 —— definite, 55 —— determinate, 55 —— discontinuous, 43, 56, 72, 73, 76, 78, 79, 87, 105, 106, 133, 159, 295 —— germinal, 106-10, 133 —— indefinite, 55, 59 —— somatic, 106-110 _Viola_, 260 _V. tricolor_, 260 Volckamer, 86 Vulture, 282 W Waggett, 12 Wagner, 369, 372 Wagtail, 122, 203 Wallace, 3, 10, 13, 14, 25, 26, 35-42, 53, 112, 114, 116, 117, 171, 175, 177, 183, 184, 207, 213, 228, 230, 251, 253, 256, 287, 296, 308, 321-7, 343, 372, 377 Wallaceian school of biologists, 14, 24, 25, 47, 192, 210, 251, 346, 347, 366, 377 Wallaceism, 172, 202 Walrus, 190 Warblers, British, 315, 332 Warning colours, 173, 176, 198, 212-26 Wasp, 174, 178, 179, 214, 227 Wasp-beetle, 229 Water-rail, 251 Waxbill, blue-bellied, 104 Weasel, 190 Weaver, red-billed, 98 Weber, 86 Weir, Mr Jenner, 299 Weismann, 25, 106, 107, 151, 154 Weka rail, 365 “Westminster Review,” 112 Weston, G. E., 127 Whale, 42, 185, 190, 193 Wheatear, 253 Whinchat, 253 Wiesner, 151 Wilson, Prof. E. B., 166 Winter coat, 188 Wolf, 48, 130, 185, 192 Wonder horse, 95, 96 Woodpecker, 102 Wright, Mr, 304 Wyman, Professor, 357 X X-element, 165