| CHAP. | PAGE |
| I. | Migration of Birds | 1 |
| | Definition—Variation of migration. |
| II. | Cause and Origin of Migration | 13 |
| | Direction of passage—The potentiality of flight—Habit of wandering—Memory—Extension of range—Influence of Temperature—Desire for Light—Glacial Epoch—Food Basis—Sexual Impulses—Competition. |
| III. | Routes | 33 |
| | Route or Broad Front—Coasting—Fly-lines—Isepipteses—Land-bridges—Coast Lights. |
| IV. | The Height and Speed of Migration Flight | 47 |
| | Altitude of Normal Migration—Variation in Speed—Effect of Wind. |
| V. | Orientation and Route Finding | 56 |
| | Route Finding—Use of Memory—Eyesight—Errors—Guidance of Young—Beam Winds—Homing of Terns. |
| VI. | The Distances Travelled by Birds | 65 |
| | The Swallow—Variation in Distances—Marking Birds—Results—Routes of the Golden Plover—Evolution of the Routes. |
|
| VII. | Migration and Weather | 83 |
| | Knowledge of Approaching Weather—Favourable and Unfavourable Conditions—Importance of Winds—Cyclonic and Anticyclonic Winds—Continental Migration. |
| VIII. | The Perils of Migration | 104 |
| | Contrary Winds—Lighthouses and Lightships—Leeward Drift—Catastrophes. |
| IX. | Early Ideas of Migration | 114 |
| | Literature—Hibernation—Carriage of Small by Large Birds. |
| X. | Suggestions and Guesses | 119 |
| | Trans-Atlantic Migration—Ship-borne Wanderers—Storm-blown Birds—Casual Wanderers—Swimming and Walking. |
| XI. | Summary | 126 |
| | Bibliography | 131 |
| | Index | 135 |
