432 



INDEX 



of, 98 sqq. ; modifications 

 due to, 376, 380 



Food-canal, structure, 98 sqq. 



Food-getting, methods of, 87 sqq. 



Foot, skeletal features, 60 ; adapta- 

 tions of, 97 



Forests, birds of, 158 



Fowl, common, syrinx of, 126 ; 

 education of young, 305, 339 ; 

 pedigree aspect, 366 ; egg- 

 laying capacity, 377 ; alcohol- 

 isation, 379-80 ; changes 

 due to selection, 383 ; hy- 

 bridisation, 391 ; Mendelian 

 inheritance, 391 sqq. 

 Houdan, abnormality, 366-7 

 Silky, mutation in, 372 



Frog (Nototrema), egg-pouch of, 

 208, 221 



Gall-bladder, functions, 106 

 Gamble, F, W., on bird locomotion, 



^ 74 . 



Game Birds, dimorphism, 211 



Gannet {Sula bassana), food-storing, 



capacity, 91 

 Garden warbler (Sylvia hortensis), 



moulting, 30 

 Germ-cells, origin of, 246 sqq. 

 Gizzard, forms and adaptations, 104 

 Glands, ductless, 138 sqq. 

 Gliding flight, 75 

 Goatsucker {Caprimulgus europoeus), 



serrated claw of , 1 6 ; nest of, 



298 ; transporting young, 



308 

 (Macrodipteryx) dimorphism, 



213, 216 

 Goldcrest (Regulus cristatus), egg of, 



271 

 Gonads, origin of, 243-4 

 Goodale, H. D., experiments on 



sex-characters, 229 

 Goose, " wing-pockets " of, 149 

 Goshawk (Astur palumbarius), form 



of ovary, 245 

 Grebe (spp.), knee-process, 62 ; 



courtship behaviour, 183 ; 



" brooding organ," 291 ; 



education of young, 306, 338 

 Great Crested (Podicipes cris- 

 tatus), courtship behaviour, 



180 sqq., 205 

 Little {Podicipes fluviatilis), 



movements of, 148 

 Greenfinch {Ligurinus chloris), nest 



of, 29s 

 Groos, K., on courtship-habits, 



204 



Grouse, Red (Lagopus scottcus), 



burrowing habit, 151; habitat 



and life, 153-4 

 (Bonasa), " snow-shoes " of, 



151 ; burrowing habit, 151 

 Grouse disease, 154 

 Guillemot {Uria troille), eggs, 155 ; 



habitat and life, 155-6 ; 



courtship behaviour, 190 ; 



egg of, 271, 273, 277 ; 



education of young, 306, 339 

 Gull, Black-headed (Lor us ridi- 



bundus), habitat, 157, 302 ; 



food of, 89, 399 ; economic 



aspect, 401 

 Herring (L. argetitatus), varia- 

 tion of dietary, 376 ; colonies, 



effect of, 414 ; economic 



aspect, 413 



Heart, structure and functions, 3-4, 



135 



Hedgerow, birds of, 158 



Heredity, 387 sqq. 



Heron (Ardea cinerea), serrated claw, 

 16 ; habitat and life, 157 ; 

 nest, 29s 



Hesperornis, knee-process of, 62 ; 

 description, 355-6 



Hoatzin (Opisthocomus), 14, 71 ; 

 crop formation, 100 ; rep- 

 tilian affinities, 347, 349 



Holmes, S. J., on voice-evolution, 

 206 



Honey-creeper (Coereba), varia- 

 tions, 372 



Hoopoe (Upupa), nest of, 305 



Hormones, properties of, 139 sqq. ; 

 relation to sex-characters, 

 228 sqq. 



Hombill (spp.), shedding of gizzard, 

 104 ; nest of, 297-8 



Horns (of Bovidae) as sex-characters, 

 218 



Huia birds, dimorphic bills, 95 



Humming birds (Trochilidae), di- 

 morphism, 210 ; egg of, 271 



Huxley, Julian, on courtship habits, 

 180 sqq., 205 



Hybridisation, 389 sqq. 



Ichthyomis, form of vertebrae, 67 ; 



description, 356 

 Ileum, functions, 106-7 

 In-breeding, 386 

 Incubation, 288 sqq. 

 Insects, coloration of, 33 ; flight of, 



81 

 Intestine, functions of, 105 sqq. 



