i4 2 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 contour 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, 126-128. 



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

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

 fisher, 86, 91; in Night Hawk, 80, 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 (see Feathers). 



Fireflies as food of young Night Hawk, 82. 



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



Fly, robber (Asilus) , 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, 116; 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 tristis, 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 cornutus), feeding of, to young Kingbirds, 103; formidable appearance and size 



of, 101, 103. 



Grasshoppers brought to nest by Robin, 39. 

 Grosbeak, Pine (Pinicola enucleator, Linn.} , range, habits, and relative tameness of, in winter and 



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

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



in young birds, 55, 101, 102. 



