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 



Teeritoky, 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 



