482 



INDEX 



Holophrya mullifiliis, reproducing 

 by sporulation (illus.), 215. 



Homologies, defined, 172; of bones 

 in vertebrate hands (illus.), 

 169; of bones in vertebrate 

 limbs (illus.), 160, 171, 172; of 

 digits of feet of mammals 

 (illus.), 178; of tail of man, 179. 



Homo sapiens, 454. 



Honey bee (illus.), 387; brood cells 

 of (illus.), 389; communal life 

 of, 387; pollen carrying leg of 

 (illus.), 388; wing, hooks of 

 (illus.), 155; wings of drone, 

 showing variation (illus.), 155; 

 (illus.), 156. 



Hooker, Th., 65. 



Horse, changes in foot of, in geologic 

 time (illus.), 303; evolution of 

 foot of (illus.), 177; hybrid of, 

 with zebra (illus.), 183. 



Horses, trotting, heredity in, 168. 



Huber, 394. 



Human embryo, head of, showing 

 embryonic hair covering (illus.), 

 174. 



Humerus, end of, of various animals 

 (illus.), 462. 



Humming bird, male and female 

 (illus.), 71; Rufus, nest of eggs 

 of (illus.), 441. 



Huxley,, 7, 25, 26, 64, 197, 309, 426, 

 457, 459, 460, 468. 



Hyatt, A., 197. 



Hybrid colt of horse and zebra 

 (illus.), 183. 



Hybridization, 88, 154. 



Hydra vulgaris (illus.), 35. 



Hyla regila (illus.), 344. 



Icerya purchasi, 62, 64. 



Ichneumon laying eggs in cocoon 

 (illus.), 359. 



Ichthyophis glutinosus, eggs carried 

 by (illus.), 338. 



Icterus, distribution and classifica- 

 tion of American species of, 



128; galbula, diagram of varia- 

 tion in, 137. 



Idioplasm of Nageli, 251. 



Imbauba tree and ants (illus.), 379. 



Inchworm (illus.), 411. 



Inheritance, exceptions to Mendel- 

 ian, 193; experimental studies 

 of, 192; Galton's law of an- 

 cestral, 184; modes of, 181, 186; 

 of acquired characters, 196. 



Insects, parasitic, 359; special adap- 

 tations of, 340. 



Instinct, 426. 



Instincts, climatic, 436; environ- 

 mental, 438; of care of young, 

 439; of courtship, 438; of re- 

 production, 439; terrifying, 431 ; 

 variations in, 442. 



Intellect, 443. 



Islands, relation of species to, 312. 



Isolation, 53; biologic, 109; geo- 

 graphic, 54, 117; physiologic, 

 54; sexual, 54. 



Jack rabbits, showing variation (il- 

 lus.), 320. 

 Jennings, H. S., 429. 



Kallima (illus.), 414. 

 Kangaroo (illus.), 339. 

 Karyokinesis, details of, explained, 



253. 



Katydid (illus.), 401. 

 Keeler, C., 420. 

 Kelvin, Lord, 44. 

 Korschinsky, H., Ill, 114, 156. 



Lacerta, diagram showing varia- 

 tion in different species of, 139. 



Lacerta agilis, regeneration of (il- 

 lus.), 286. 



Ladybird, Australian (illus.), 62, 64; 

 beetles (illus.), 416; convergent 

 variation in pattern of (illus.), 

 132; (illus.), 133. 



Lamarck, 48, 55, 111, 196; evolu- 

 tionary principle of, 196. 



