CONTENTS. 



CHAPTER I. 



ANCIENT AND MODERN VIEWS ON MIGRATION. 



Ancient Writers on Migration — Their Clear Ideas on the 

 Subject — Migration to the Moon — Old Observers of 

 Migration — Mystery surrounding Migration — Trans- 

 formation — Hibernation — The Theory still believed in 

 — Evidence for and against — The Theory of Blind 

 Instinct — Its Impossibility — The Simplicity of Migra- 

 tion — Not a Universal Habit — Instances Confirming 

 this — Results of Lapsed Migrations — The Law of 

 Lapsed Migrations — Necessity of Migration in Autumn 

 — Love of Home — Impulse to Migrate Hereditary — 

 Antiquity of Migration — Its Ancient Origin — Necessity 

 for seeking the cause of Migration in Past Ages 



CHAPTER IL 



GLACIAL EPOCHS AND WARM POLAR CLIMATES. 



The Origin of Birds — Fossilized Remains — Remote Ter- 

 restrial Changes — The Post-Pliocene Glacial Epoch — 

 Warm and Cold Glacial Periods — Origin of Migration 

 — Changes through Tertiary Time — Local Glaciation 

 and Vertical Migration — Probable future of Migration 

 — Initiation of Migration in the Charadriid/E — Effects 

 of Polar Darkness on Birds — Birds feeding at Dusk — 



