A Accentor, 1 _Accipitcr cooperi_, 243 Acorn, 49 Acquired characters, 10, 14, 15, 18-24, 60, 107-10 _Acræeidæ_, 175, 215, 228 _Ægilops speltæformis_, 118 _Ægithina tiphia_, 244 Æsthetic sense in birds, 306 “African Nature Notes and Reminiscences,” 192, 195, 199 Aggressive resemblance, 173 Aguara-guazu, 181 Aitken, E. H., 64 “Albany Review, The,” 43, 48, 195, 204 Albinism, 64, 65, 99, 283, 284, 362 _Alcedo ispida_, 289 Alcock, Col., 216, 217 Alcohol, 152, 153 Alexander, 181 Allen, Grant, 66 Allotrophy, 159 Alternating characters, 143 Alternative inheritance, 127 Amadavat, 311 _Amandina erythrocephala_, 122 _A. fasciata_, 122 “Amazement,” 93 Amazon parrot, 103 Amazonian dolphin, 99 Ammonites, 67 Ammonium sulphate, 151 Amœba, 35 _Amphidasys betularia_, 101 _Anas boscas_, 123, 334 _A. obscura_, 334 _A. pœcilorhyncha_, 315, 334 _A. superciliosa_, 315, 334 _A. undulata_, 334 _Anastomus oscitans_, 282 Ancon sheep, 95 _Anemone magellanica_, 118 _A. sylvestris_, 118 Anemophilous flowers, 261 “Animal Colouration,” 194, 205, 211, 213, 218, 222 “Animal Life and Intelligence,” 368 “Animals of New Zealand,” 382 _Anous_, 278 _Anser cygnoides_, 114 _Anseranas melanoleucus_, 281 Antarctic fauna, 191 Antelope, 48, 199, 334 _Anthracoceros_, 220 _Anthropoides paradisea_, 279 _A. virgo_, 279 _Antilope cervicapra_, 363 Ape, 101 Apogamy, 370 Appenzeller, 340 _Apus_, 381 “Archiv für Entwicklungsmechanik der Organismen,” 325, 330 Arctic fauna, 173, 174, 190, 191 Arctic regions, 173, 189 _Ardea asha_, 317, 318 _A. gularis_, 318 _Ardeola grayii_, 250, 254 Argali, 120, 130, 131 “Argentine Ornithology,” 361 _Argynnis pales_, 381 _A. paphia_, 103 Aristotle, 1 _Artemia milhausenii_, 156 _A. salina_, 156 Aseel, 364 Asexual reproduction, 135 Asiatic, 140 Ass, 117, 127, 128, 140 _Astur badius_, 235 Atavism, 136, 293 _Athene chiaradiæ_, 97 _A. noctua_, 97 Atoms, biological, 158 “Auk, The,” 190 _Aularches militaris_, 216 Avebury, Lord, 205, 260 “Avicultural Magazine, The,” 98 Avocet, 80