INDEX 
Bones—contznued 
Ribs, 16, 25 
Scapula, 14, 50, 83, 197 
Shoulder-blade, see Scapula 
Skull, 19-22 ° 
Squamosal, 33 
Sternum, 13, 14, 50 
Supra-scapula, 14 
Tarso-metatarsus, 18 
Thigh-bone, see Femur 
Tibia, 7, 9,16, 17 
Tibio-tarsus, 18 
Ulna, 6, 7, 8,10 
Uncinate processes, 16, 40 
Upper-arm bone, see Humerus. 
Vertebra, 21, 23, 32, 38, 83 
Vertebral column, 22-26, 251, 
_ 255 
Brain, 117-121, 280 
Breathing, 78-96 
Bronchi, 78 
Bullfinch, 139, 333 
CAPILLARIES, 69 
Carinatee, 383, 391 
Cartilage, 14 
Cassowary, 74, 149, 161, 302 
Cerebellum, 118, 280 
Cerebral hemispheres, 117, 280 
Chalazee, 276 
Choroid, 126 
Chyle, 71 
Circulation, 68-72 
of fish, 278 
Classification, 379-390 
Claws, 37, 50 
Cochlea, 133 
Cold-blooded animals, 48, 96, 104, 
105 
Coloration, 297-320 
of eggs, 321 
of eye, 130 
Patterns, 302 
Protective, 304, 315 
Sexual, 305 
Variety, 297--301 
Colour, change of, without moult- 
Ing, 159 
Colours, objective and subjective, 
298 
Condor, 119, 239 
409 
Conduction, 100, 101 
Condyle, 31 
Connecting links 41 
Cormorant 63, 66, 107, 164, 171, 
227, 307, 400 
Cornea, 124 
Corpuscles, see Blood 
Correlated variation, 57, 314 
Corti, organ of, 134, 343 
Crocodile, 39, 86, 170, 284 
Crop, 62, 63, 287 
Crow, 404 
Cuckoo, 155, 165, 329, 337, 386 
DarTER, 66, 171 
Death-feigning, 343 
Diaphragm, 84-86 
Digestive apparatus, 60-68 
Digits, 9, 18, 42-46, 50 
Dinosaurs, 47, 51 
Divers, 107, 108, 239 
Duck, 156, 162, 225, 366 
Duodenum, 66 
EAGLE, I1I, 197, 292 
Ear, 131-136 
Egg, 277 
Eggs, coloration of, 321 
of guillemot, 325 
Egg-tooth, 278 
Embryo, 77, 275-285 
Emeu, 43, 149, 343 
Epiglottis, 78 
Epiphyses, 32 
Eustachian tubes, 134 
Evaporation, 99-301 
Eye, 119, 121-131 
FEATHERS, 144-154 
Contour, 152 
““ Downs,” 146 
Elasticity of, 202 
Filoplumes, 146 
Hackles, 314 
Nestling “ downs,” 150 
Powder-down, 146 
Rectrices, 153, 214 
Remiges, 152, 202 
Flight, 173-274 
Force exerted in, 259 
