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History. A stimulating monograph describing several years of coordi- F 
nated observations of nocturnal migrants as seen through telescopes © 
_ against the face of the moon. An impressive body of evidence is pre- : 
sented which suggests that in the lower Mississippi valley the ieee : 
migration is correlated with wind direction and atmospheric conditions. 
Rowan, W Light and seasonal reproduction in animals. Biological | 
' Reviews, Cambridge, England, 13:374-402, 1938. A review of the éx- _ 
tensive work of Rowan and others on the role of day length in the tming | a 
of eat aaah behavior and migration in birds. 
describes I. Ribera experiments with pigeons that show how well hey | i 
can remember detailed visual patterns evenafter as much as four years. / 
Thompson, A. L., Problems of bird migration. London, 1926. The. 
f er thoughtful of the general works on bird saseeue 
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Thorpe, W. H. et al., A discussion on the orientation of birds on 
bird visiting by a Spent of pee. sees and physicists. 
Yeagley, H. L., A preliminary study of a physical basis of bird : 
navigation. Journal of 2 Applied Physics, 18:1035-1063, 1947. A presen- | i 
tation of a controversial theory of bird navigation thatassumes birds to : 
be sensitive to terrestrial magnetism and to the Coriolus Force. 
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