448 



INDEX 



Coloration, 242 



Color-blindness, a sex-linked char- 

 acter, 364; inheritance of, 365 



Columbian elej^hant, 398, 399 



Comanchean, 122 



Combinations, 2i58 



Commensalism, 240 



Communal associations, in insects, 

 239; in man, 240 



Comparative anatomy, 3, 68 



Competition, 6; and natural selec- 

 tion, 388; and useful characters, 389 



Complementary factors, 319 



Concealing discharges, 237 



Concealment, 230 



Concord grape, 344 



Conductivity, 90 



Consciousness, 1, 2 



Continuity of germ plasm, 422 



Continuous variations, 267 



Contractility, 90 



Convergence, 27 



Corals, 214 



Coral snake, 242 



Corixidae, 254 



Corn, origin of, 271; and Mendelian 

 inheritance, 286, 287; hybridiza- 

 tion and selection, 342; crosses of, 

 344; heterosis in, 343; sex reversal 

 in, 336 



Correns, 276 



Corythosaurus, 153 



Craniata, 144 



Crayfish, 134 



Cretaceous, 122; Bryozoa of, lr'/2 



Cretaceous Eocene, change of climate 

 during, 248 



Cretinism, 95 



Crew, 335 



Cricolus, 151 



Crinoidea, 131 



Crocodilia, 237 



Cro-Magnon race, 206; sculpture, 

 206, 207; implements, 207; mental 

 development, 208 



Cross fertilization, 231 



Crossing over, mechanism of, 309; 

 multiple, 309, 310; percentage of, 

 311, 312; in Drosophila, 307, 308 



Crossopterygii, fins of, 76, 149 



Crows, 239 



Cryptohranchus allegheniensis, skull, 

 58 



Cryptopsaras coursii, 216 

 Crypt urus variegalus, 244 

 Ctenophora, 28 

 Cumulative factors, 318 

 Cursorial adai)tations, 218 

 Cuttlefishes, 132 

 Cuvier, 11, 413 • 

 Cyclostomata, 37 

 Cydninae, 254 

 Cynodontia, 157 



Cytoplasm, 32; role in inheritance, 

 301; differentiation in eggs, 302 



Dactylethra, jjelvic girdle, 78 



Daphnids, 356 



Dark Ages, 8 



Dart, Raymond, 199 



Darwin, Charles, 9, 12, 13, 230, 250, 

 269, 369, 385, 413 



Darwin, Erasmus, 9, 10, 370, 413 



Darwinian theory, 385, 418, 428 



Darwinism, see Darwinian theory 



Davenport, C. B., 362 



Deaf-mutism, inheritance of, 367 



Debris, floating, as aid to dispersal, 

 258 



Deep-sea fishes, 216 



Deer, protective adaptation, 236; sig- 

 nal marks, 243 



Defectives, inbreeding of, 367; segre- 

 gation of, 382; sterilization of, 382 



Defects, inheritance of, in man, 366 



Democritus, 5 



Denlalium, 302, cytoplasmic differ- 

 entiation of egg, 302 



Dentition, heterodont, 159; of ele- 

 phant, 168; of horse, 175, 177 



Dermal bones, 55 



Desert, Great Salt Lake, 255 



Detlefsen, 418, 420 



Devonian, 123, 150; amphibia of, 

 130; trilobite of, 134 



De Vries, Hugo, 12, 276, 402 



Dibclodon, 170 



Differential birth rate, 377; causes of, 

 379 



Dihybrid, 279; ratios, 281, 282 



Dinosaurs, 153, 219 



Dinolherium, 169 



Diploblasts, 34 



Diplocaulus, 151 



Diplopoda, 136 



Dipnoi, 149 



