The Riddle of Migration

Abstract

THE author of this book is professor of zoology in the University of Alberta and he has most courageously undertaken the experimental study of the causes of the migration of birds. Some most astounding facts—experimental and observational—are recorded in his book. Edmonton, the city in which the University is situated, has wonderful advantages for this study. The tremendous contrast between the seasons in Canada compels practically all the birds to migrate. The minimum temperature in winter may drop to -52° F., whilst the summer temperature may rise to 100°. Then to the north an unbroken plain stretches to the shores of the Arctic Ocean, whilst to the south-east a similar plain reaches the Gulf of Mexico, so that the physical obstacles to migration are slight.

The Riddle of Migration.

By William. Rowan. Pp. xiv + 151. (Baltimore, Md.: The Williams and Wilkins Co.; London: Baillière, Tindall and Cox, 1931.) 11s. 6d. net.