INDEX 



307 



Sexiuil i ns ti net in tho migratory 



malo, 26 

 - of Reeve, 173 



reawakening of, 4, 18 



litV 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 



TERRITORY, 1, 5 



adjustment of, 10 



, 

 169-214 



breeding, 2, 3, 7 



dates of acquisition of, 33 



defence of, 6 



desertion of, after rearing 



young, 276 



disposition to defend, 7:^ 11^ 



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, 1 



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, 2-2-2, 



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, [ 



