INDEX 



Aberration, 71 



Abraxas, experiments, 36 



— , variation in genitalia, 156 



Absolute values, 346 



Acalla, polymorphism, 102 



Accipiter, colour-phases, 94 



Accommodation, 233-34 



Achatinella, geographical races, 108 



Ackert, experiments on pure lines, 191 



Acraea, gregarious larvae, 246 



— , nature of specific characters, 262 



Acraea alciope, dimorphism, 1 1 



Acronycta, species more distinct as 



larvae, 123 

 Adaptable species, 350 

 Adaptation, Berg's view, 363 

 — , bones of vertebrates, 272-73 

 — , deep-sea and cave forms, 269-71 

 — , functional, 274 

 — , internal, 273 

 — , life in torrents, 265 

 — , organismal, 352 

 — , parallel, 326 



— , relation of organisation to speciali- 

 sation, 364 

 — , relation to group-formation, 369 

 — , specialisation, 349 

 — , statistical, 351 

 — , survival, in absence of, 355 

 — , Thompson's view, 364 

 — , useful characters, 348 

 — , use of term in connection with 



food-races, 303 

 Adlerz, change in population of 



Polyommatus, 213 

 — , habits of Deuteragenia, 277 

 Agamodon, character of snout, 286 

 Agar, experiments on Simocephalus, 39 

 — , non-inheritance of lesions, 35 

 Agassiz, permutations of characters, 60 

 Age and area, 82 



Agriades, isolation of races, 143, 158 

 Agrotis, voltinism, 144 

 Albinism, 92 

 — , Reindeer, 242 

 Alcidis, mimicry, 252 

 Alcohol, defects induced by, 30 

 Alkins, colonial divergence in Clausilia, 

 94, 163 



Alkins, correlation in various Molluscs, 



163 

 Alkins and others, correlation in 



Sphaerium, 164 

 Allard, physiological races in Ortho- 



ptera, 74 

 Allen's Law, 45 



, application to British mice, 48 



Allolobophora, lack of geographical races, 



no 

 Alpatov, differences between ants from 



different nests, 70, 72 

 — , geographical races, 69 

 — , hereditary stability of races, 70 

 - — , Honey Bee, geographical ' trends,' 



46 

 Alteration, 59 



Alytes, experiments on, 36 

 America, South, endemism, 135 



, mimicry in wasps, 259 



Ammomanes, protective resemblance, 238 



Ammonites, orthogenesis, 327 



— , complex folding of suture, 332 



Amphidasys, spread of melanic form, 213 



Amphidromus, geographical races, 108 



Amphisbaenidae, character of snout, 286 



Anableps, genitalia, 151 



Anisoscelis, enlargement of tibia, 331 



Annandale, adaptive differences in 



Tetilla, 289 

 Annandale and Hora, adaptive differ- 

 ences in fish, 283 



, parallel variation, 326 



Annandale and Rao, forms of Limnea 



determined by speed of current, 81 

 Anolis, protective resemblance, 240 

 Anomia, influence of substratum, 81 

 Anopheles, zootrophic races, 120 

 Antennal scrobes, in insects, 308 

 Ants, differences between nest-popu- 

 lations, 70, 72 

 ■ — , nest-temperature, 360 

 — , runways as controllers of environ- 

 ment, 360 

 — , species, age of, 131-32 

 Apis, geographical ' trends,' 46 

 — , hereditary stability of races, 70 

 — , variation maintained throughout 

 season, 208 



