CONTENTS xiii 



PAGE 



an illustration Migration of a troupial Fear in birds 

 and false associations Direction of migration Un- 

 rest Flying north Migration of rock-swallow Pull 

 of the north Perturbations in migration Upland 

 plover . * . ."-".'" . . . V 183 



XIII 



No hard and fast line between migrants and non-migrants 

 Swallows and partridges Contrasted behaviour in 

 two mocking-birds Spur-wing lapwing An instinct in 

 a state of flux Migration in other creatures Fishes 

 and insects Kirby and Spence speculate Spiders 

 Mammals Migration a danger Sand-grouse and 

 the "Tartar invasions of Europe" A "sense of 

 polarity " the origin of migration A trace of this 

 sense in man . : , . . . . 205 



XIV 



The pampas Indian's battle-cry Terrifying effects of sound 

 generally Other aspects of sound Effect of a power- 

 ful sneeze The human voice at its loudest Account 

 of a man with a big voice Sound in the ears of the 

 drowning Sound of big bells heard in a belfry A 

 great thunder-clap The phenomenon and the dream 

 The wilderness of the mind . . . .227 



XV 



The rhea's voice Sounds that carry farthest Man and 

 animals compared as to voice power The swift's 

 flight Melody Music as art and instinctive Mam- 

 malian music Capybara Quis Tuco-tuco Singing 

 mouse and small rodents Monkeys Braying of the 

 ass as music A purge for the mind The ass in fable 

 and folk-story . . . . . . . 239 



