INDEX 



253 



Tree-creepers, 60 

 Tree-pipit, 55, 82 

 Turkey, 86, 89 

 Tyrant flycatcher (Am. ), 60 



Vancouver wren, 135 

 Variation, 140 



absence of, 144 



at end of song, 156 



in blackbird's alarm, 236 



in blackbird's song, 108, 148 



in chaffinch, 148, 235 



in cock-crow, 234 



in robin's alarm, 157 



in speed, 157 



instances of, 146 



local, 146, 149 



progressive, 36, 148 



transient, 153 

 Voice, accidental, 17-19 



Voice, Darwin's theory of, 13 

 origin of, 12 



Warblers and thrushes, 95, 117 



Wheatear, 168, 222 



Whinchat, 168 



Whitethroats, 68, 105, 107, 112, 



113, 223 

 Willow-warbler, 52, 56, 61, 65, 67, 



147, 149, 150, 151 

 Wings, moved in song, 56 

 Woodhewers (S. Am.), 60 

 Woodlark, 65 

 Woodpeckers, 46 

 Wood-wren, 56, 67, 80, 145 



Yellow bunting, 51, 55, 67, 187 

 Young birds, cries of, 44 



Zebra finch, 53 



THE END 



Printed by R. & R. Clakk, Limited, Edinburgh 



