INDEX 



307 



Sexual instinct in the migratory 

 male, 26 



— of Reeve, 173 



reawakening of, 4, 18 



— life of birds, 1 



— maturity, males arrive at, 



before females, 36 



— organic change, 92, 123 



— selection, 166 , 

 Shag, 121 



Shrike, Red-backed, 39, 50, 51, 



156 

 Skylark, 188, 236, 244 

 Snipe, 153, 156, 219,:220 

 Sociability when not paired, 



125, 126 

 Song, as an aid in searching 



for a mate, 12 



— its influence on mating, 167 



— origin of, 138 



— relation to reproduction, 123 



— relation to territory, 119-168 



— volume of, influenced by age, 



seasonal sexual develop- 

 ment, or isolation, 166 



Song-Thrush, 222, 244 



Sparrow, House, 218 



Sparrow-Hawk, 269 



Spring, at approach of, birds 

 loose their shyness, 138 



Stability of the water and 

 mobility of the land, 260 



Starling, 217, 218, 237, 251 



Stimulation, internal, 62, 123 

 question of, 284 



Stonechat, 87 187, 188, 189, 

 222, 233, 234 



Stout, Dr, Manual of Psycho- 

 logy, 1, 77 



Struggle for existence, 294 



Susceptibility to position, 96 



Swallow, 21, 156, 278 



Tbeeitoey, 1, 5 



— adjustment of, 10 



Territory and reproduction, 

 169-214 



— breeding, 2, 3, 7 



— dates of acquisition of, 33 



— defence of, 6 



— desertion of, after rearing 



young, 276 



— disposition to defend, 73-118 



— disposition to secure, 6, 20-72 



— establishment of, 74, 285 



— evolution of, 176 



— failure to secure, 286 



— fights for, 10, 11, 13, 62 



— ownership of, 189 



— possession of, a stimulus to 



song, 136 



— its relation to migration, 259 



— its relation to reproduction, 



169-214 



— readjustment of, 147 



— restriction of, advantageous 



for mating, 172 



— restricted, 8, 9, 30, 50, 58, 64 



— separate for male and female 



Cuckoo, 144 



— song, its relation to the, 



119-68 



— temporary desertion of, 28 



35, 58, 59 



— and hostility, relationship 



between, 242 

 Thrush, Song, 222, 244 

 Tit, Blue, 221, 226 



— Great; 221 



— Long-tailed, 226 

 Tradition, 300 



Tree-Pipit, 51, 188, 189, 222, 



232, 244, 278 

 Turtle-Dove, 126, 232 



Union of sexes, 12 



Ussher, H. B., on the hostility 

 between Choughs and 

 Hooded Crows and 

 Choughs and Ravens, 227 



