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CHAP. PAGE
Definition--Variation of migration.
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.
Route or Broad Front--Coasting--Fly-lines--Isepipteses --Land-bridges--Coast Lights.
Altitude of Normal Migration--Variation in Speed--Effect of Wind.
Route Finding--Use of Memory--Eyesight--Errors--Guidance of Young--Beam Winds--Homing of Terns.
The Swallow--Variation in Distances--Marking Birds--Results--Routes of the Golden Plover--Evolution of the Routes.
Knowledge of Approaching Weather--Favourable and Unfavourable Conditions--Importance of Winds--Cyclonic and Anticyclonic Winds--Continental Migration.
Contrary Winds--Lighthouses and Lightships--Leeward Drift--Catastrophes.
Literature--Hibernation--Carriage of Small by Large Birds.
Trans-Atlantic Migration--Ship-borne Wanderers --Storm-blown Birds--Casual Wanderers--Swimming and Walking.
BIBLIOGRAPHY 131
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