408 



INDEX 



Culicella, species separable as larvae 

 only, 122 



Cunningham, criticism of Weldon's 

 work on Carcinus, 197-98 



Cyclic and acyclic Crustacea, race- 

 formation, 105 



Cyclommatus, heterogony, 166 



Cynips, galls as specific characters, 121 



Cynomyia, seasonal variation in geni- 

 talia, 152 



Cyrtacanthacris, varying degree of race- 

 formation, 108 



Cytology, ' New,' 363 



Dakin, eyes of Lamellibranchs, 307 

 Damaster, polymorphism, 101 

 Daphnia, change in population, 215 

 — , modification of helm, 39 

 — , variation, 21 



Daphnia acutirostris, seasonal poly- 

 morphism, 12 

 Darts, in Mollusca, 293 



, as specific characters, 297 



Darwin, abundant species vary most, 



90, 139 

 — , evolution of co-adaptations, 306 

 — , on habits of Parus major, 54 

 — , origin of domesticated races, 188 

 — , original statement of Natural 



Selection theory, 181-84 

 — , simultaneous occurrence of special- 

 ised and unspecialised forms, 

 349-50 

 — , tail-pattern of Argus pheasant, 272 

 — , thickened soles of human embryo, 



43 

 — , tusks of Babirusa, 336 

 — , views on nature of variation, 183, 



216 

 Dasymutilla, influence of food on size, 79 

 — , influence of size on mating, 1 56 

 Dauermodifikationen, 372 

 — , definition, 4, 59 

 — , production of, 29, 35, 36, 39 

 Davenport, selective elimination of 



fowls, 206 

 Dawson, voltinism in insects, 52 

 Death-rates of animals in nature, 193 

 Deep-sea fauna, blindness in, 43 



-, characters of, 269-70 



Deer, heterogonic growth in antlers, 



337 

 Deer-mice, see Peromyscus 

 Delcourt, intermediacy in Notonecta, 



88 

 — , local interbreeding of species in 



Notonecta, 158 

 Demaison, spread of melanic Lepido- 



ptera, 213 

 Dendy, on momentum, 340, 341 



Dendy, on orthogenesis, 325 

 — , on tusks of Babirusa, 336 

 Deronectes, geographical races, 112 

 Desert animals, avoidance of high tem- 

 peratures, 360 



, colour-convergence, 259 



, evolution of coloration, 281 



, protective resemblance, 239 



Design in evolution, 374-75 

 Determinate evolutionary path, 325 

 — variation, 208, 372 

 Detlefsen, callosities of ostrich, 43 

 — , experiments on Cavia, 36 

 — , experiments on Phratora, 36 

 — , inheritance of induced modifica- 

 tions, 31 

 Deuteragenia, correlation of habits and 



structure, 277 

 — , nest, 278 



Development, nature of, 1 79 

 — , the characteristic exhibition of 



organisation, 362 

 Dewar and Finn, resemblance between 

 birds living in different countries, 

 255-56 

 Diabrotica, change in pattern, 209 

 Dice, coat-colour of rodents in lava 



fields, 236 

 — , definition of subspecies, 69 

 — , specific intergradation in Peromys- 

 cus, 89 

 Dicrostonyx, variable degree of race- 

 formation, 107 

 Didelphys, habits, 355 

 Dietze, isolation of species of Eupithicia, 



.*43 

 Dimorphism, definition, 1 1 



Dinoflagellata, restricted variation in, 



.7 

 Diptera, mimicking Hymenoptera, 



.257-58 



— , winglessness, 147 



Discontinuous variation, 5 



Disharmonies in growth, 340 



Disharmony, 325 



Dispersal, effects on race-formation, 



104-5, 1.35 



— , effects of rivers, 116, 134 



— , effect of size, no 



— , loss of powers of, 1 47 



Dobrovolskaia, effect of X-rays on 



mutation-rate, 29 

 Dobrzansky, polymorphism, 282 

 — , polymorphism in Harmonia, 103 

 Dodds and Hisaw, adaptation of 



Baetis to water-flow, 266 

 Doflein, protective resemblance of 



Anolis, 240 

 Domesticated races, evolutionary signi- 

 ficance of, 1, 188 

 , recombination in, 25 



