é 
4 
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y. 
i 
THE MIGRATION OF BIRDS 
IN WINTER 
in the animal 
creation which 
has excited more wonder 
and speculation in man- 
kind than that mysterious 
going and coming of birds, 
called migration. For ages 
past it has been going 
on; Aristotle quoted, ‘‘One 
swallow does not make a 
summer,” and Homer com- 
pared the noisy march of 
the Trojons to the clamor- 
ous flight of a flock of 
cranes migrating  south- 
ward. 
That young birds are sud- 
denly seized with an uncon- 
trollable impulse to start 
for warmer regions, is some- 
177 
