142 Index. 



Excreta, character of, in young of passerine birds, 104; disposal of, by parents, 104-107; character of, 

 in young Kingfisher, 107; use of, as food by adult birds, 105-107, 109; character of, in Eagles 

 and Hawks, 108; actions of Cedar-birds in taking, devouring, or removing, from nest, 106, 107; 

 use of, as food in Chestnut-sided Warblers, 109. 



Eyelids, angular contoxir of, in young Night Hawk, So. 



Eyes, opening of, in young of Cedar-bird, 59; in young of Red-eyed Vireo, 64. 



F. 



Fauna of Galapagos Islands, peculiar character of, 136, 137. 



Faxon, W., 51. 



Fear, the instinct of, 3; the suppression of, 4; development of, in relation to appearance of feather- 

 shafts of wings, 6; suppression of, in Cedar-bird, 17, 57, 59; in Oriole, 19; in Redwing Black- 

 birds, 20, 21; in Kingbird, 22, 27; in Robin, 39, 40, 45; appearance of, in young Cedar-birds, 

 56, 60; in young of Red-eyed Vireo, 69; suppression of, in adult Bluebird, 72, 73; in Catbird, 

 76-78; development of, in young Catbirds, 77, 79; nature, time of appearance, sudden mani- 

 festation, and adaptive value of, 117-124; instinct of, in domestic chick, 119; in ducklings 

 of Black Duck, 120; of Hawk in sky, expressed by chick, 120: distinction between inherited 

 and acquired. 121, 137; expression of, in Robin, 122; checked by hunger, 126128. 



Feathers, development of, as guide in controlling nesting site, 6; development of, in Cuckoos, 6; down, 

 in Bluebird, 75; development of, in Red-eyed Vircos, 64, 68: in Catbirds, 77, 78; in King- 

 fisher, 86, 91; in Night Hawk, So, 85; condition of, at birth as basis for classification, 117; 

 development of, relation to fear, 6, 117-124. 



Feather-shafts, appendages of, in Cedar-bird, 52, 60 (sec Feathers). 



Fireflies as food of young Night Hawk, 82. 



Fish, captured by Kingfisher, 90; resources of Kingfisher to prevent escape of, 92. 



Fly, robber (Asilns), fed to young of Bluebird, 73, 74; escape of, from grasp of Kingbird, 102, 103. 



Focusing-cloth, adjustment of, in tent, 31. 



Food, of young Cedar-birds, 17, 18, 55, 61; of young Baltimore Orioles, 19; of Kingbird, 28, 102, 103, 

 116; of young Robins, 39, 48, 1 16; of Robin in summer and winter, 48; of Cedar-bird, 52, 62, 

 63; economy of, in Kingbird, 28, 102; in Red-eyed Vireos, 68; in Chestnut-sided Warbler, 

 109; distribution of, to young Cedar-birds explained, 55; and its distribution in Red-eyed 

 Vireos, 67-69; of young Bluebirds, 75; of young Catbirds, 78, 79; of young Kingfishers, 

 90-92; of young Night Hawk, 82; of Hawks, Owls, and other birds under exceptional con- 

 ditions, 116. 



Foster-children, treatment by Kingbird, 27. 



Fowl, domestic, stupidity and pugnacity of, 134. 



Fruits, fed to young by Cedar-birds, 17, 61; by Orioles. 19; by Robins, 48; eaten by Robin in winter, 

 48; cultivated, eaten as makeshift, 48; served to young of Red-eyed Vireos, 68, 69; of Cat- 

 bird, 76, 77, 79. 



G. 



Galapagos Islands, observations of Darwin on fauna of, 136, 137. 



Gluttony in Cedar-birds, 101, 102. 



Goldfinch, American (Spinus Iristis, Linn.), lateness of breeding of, 52; attracted by Robin's alarm, 123. 



Goose, Canada (Branta canadensis, Linn.), young of, 117; tamability of. 127, 129, 130; habits and 



breeding of, in captivity, 129. 130. 

 Grampus (Corydalus cornntus) , feeding of, to. young Kingbirds, 103; formidable appearance and size 



of, 101, 103. 



Grasshoppers brought to nest by Robin, 39. 

 Grosbeak, Pine (Pinicola ennclcator, Linn.), range, habits, and relative lameness of, in winter and 



spring, 135, 136; capture of male of, with hat, 135. 

 Gullet, distcnsibility of, in the Cedar-bird, 55, 61; effect of full, in young, 101; automatic response of, 



in young birds, 55, 101, 102. 



