486 
226; Woodcock, 
Woodpeckers, 245 
Blackbird, down on nestling, 26 
Blood, circulation of, 182, 183, 184; 
compared with amoeba, 185; red 
corpuscles of, 184, 185; white cor- 
puscles of, 185 
Bobolink, cause of colour change in 
spring, 297 
Bob-white, effect of climate on, 293 
295; moult of, 43 
Body, of Herons, 286; Petrels, 286 
wld, 22%, 222: 
Body-feathers, of Apteryx, 289, Cas- 
sowary, 288; Snowy Egret, 305, 
322; Emeu, 36, 289; Ostrich 236, 
288; Scaled Partridge, 289;  Pen- 
guin, = 2S9; Rock-jumper, 288; 
Snake-bird, 289 
Boltenia, notochord of, 67, 67 
Bones, of embryo chick, 473; hollow- 
ness of, 175, 176; of mammal skull, 
103; relation to flight, 176; of skull, 
107 
Breast-bone, 79-84; evolution of, 79 
Breast ornament of Wild Turkey, 280 
Brain, of bird compared with that of 
crocodile, 200; with that of Tricera- 
tops; 200; with that of Walrus, 200; 
embryo, thirty-six hours old, 472; 
great size in birds, 199, 200, 201; 
importance of, 198; nerves of, 202; 
protection of, 196 
Bulk, birds of largest, 285 
Bustard, chin-feathers of Great, 267; 
weight of, 285 
Butterfly, eggs of, 428; torn by birds, 147 
Buzzard, Black-breasted, feeding on 
Emeu eggs, 159 
C 
Canals, semicircular, 218 
Caracara, head of, 271, 272; foot of, 378 
Carp, compared with Scaled Partridge, 
289, 290 
Carrion Hawk, Chimango, food of, 162 
Cassowary, 
body feathers of, 288 
eggs of, 436, 453; colour of, 453, 454; 
character of shell of, 460 
helmet of, 275, 288; lack of tail of, 
402; tracks of, 396; wing of, 321, 
337, 338 
Catbird, use of wing in young. 322 
Caterpillar, used as food by birds, 146 
Cells, of blood, see Blood; of feathers, 
34; of muscle, see Muscle 
Cerebellum, 201 
Chewink, foot of, 367 
Chicken, stomach glands of, 135 
Index 
Chuck-will’s-widow, comb on toe of, 369 
Circulatory system of pigeon, 183 
Classification, based on toes, 354, 555 
Clavicle, function of, 85; of Hoatzin, 86; 
in mammals, 86 
Claws of foot, 368 
three on wing of, Osprey, 322; Ostrich, 
338, 339; Swan, 322 
Climate, effect on plumage of, Bob- 
white, 292, 295; Song Sparrow, 292, 
295; South American Pipit, 295, 296; 
Turkey Vulture, 322; White-throated 
Sparrow, 291, 294; Wood Thrush, 294 
Cockatoo, feet of, 371; Leadbeater, 
crest of, 260 
Cocoon, as food, 146 
Cod, eggs of, 428 
Collar-bone, see Clavicle 
Colour, 
of birds, 287; of young birds, 316, 317; 
blindness, 301; breast of Bleeding 
Heart Pigeon, 306, 308 
change in moulting of Bald Eagle, 
296; Scarlet Tanager, 294, 297; 
Siberian Black Lark, 295, 297 
of eggs, 430 
of feathers, 53-61; causes of, 54-56; 
patterns of, 56-60 
in mammals, 287; phases, double, 314; 
relation to haunts, 296-314; use of, 
i yas 
Coloration, aggressive, see Aggressive 
coloration; protective, see Protec- 
tive coloration 
Columella, of Owl, 110, 109 
Comb, of Condor, 271; Domestic Cock, 
274; Heron, 387, 388; on toe of 
Chuck-will’s-widow, 369 
Condor, feathers of, 36; flight of, 324, 
326; wattles of, 271 
Condyles of skull, 108 
Coot, foot of, 387 
Coracoid, function of, 84; in man, 85; 
in reptiles, 84 
Cord, spinal, 202 
Cormorant, bill of, 227, 228; character 
of egg-shell of, 460; gullet of, 133; 
iris of, 256; method of fishing of, 154; 
tail feathers of, 400 
Corpuscles, see Blood 
Courlan, food of, 153 
Cuckoo, aggressive coloration of, 311; 
colour of eggs of English, 456, 458; 
foot of, 372 
Curassow, Banded, crest of, 261 
Crab, used as food, 149 
Crane, 
Crowned, crest of, 264; head of, 252, 
265 
Demoiselle, crest of, 267, 295 
