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INTRODUCTION by BRIAN VESEYFITZGERALD AUTHORS PREFACE
Bird Migration and Other Phenomena
A SCEPTICAL AGE PASSING
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aeroplane air-currents American golden plover appearance assume autumn Bernard Acworth biologists bird flight Bird Migration bird world bird's brood calm Camberwell Beauty caterpillar chapter chrysalis Clouded Yellow colour common cuckoo conclusions course creatures Cuckoo Problems cuckoo's egg Cuckoo's Secret curves of flight desertion distance dome drift earth earth's atmosphere ebb and flow Eltringham entomologists evolution evolutionary example experience fact female fixed spot flight of birds flight-speed flying speed food-plant habit head to wind insects instinct laws of currents laws of flight machines male mate migration miles mimicry mind moth movement moving air moving medium mysteries native Natural History nest observer ornithologists Painted Lady perfect phenomenon physical reach readers reason relative seems sense of direction ship speed of flight Stuart Baker swallows T. A. Coward temperature terrestrial theory tropism true truth vagrants variable variations variety varying velocity wings