Migration in War-time 
tions in France and Flanders. In any case, 
it is a somewhat arbitrary assertion to state 
that certain migration routes were deserted 
when these very routes are themselves still 
only problematical. 
Such birds as were migrating during the 
heavy anti-aircraft barrage of September 
1917 and whose path across the moon-lit 
sky led over London, must have been con- 
siderably disturbed by the bursting of shells. 
The raid periods in 1917 coincided with 
the autumnal migration of such birds as the 
WHIMBREL, but possibly they ‘“‘rose to the 
occasion ’’ or somewhat diverted their course 
on seeing the barrage from afar, for not a 
single bird was found whose death could be 
attributed to a shell splinter. Small birds, 
if migrating on those nights, would probably 
be travelling below the barrage, and Sep- 
tember would be too early in the year for 
many GEESE or Ducks to be on their journey 
south. Their passage over any bombarded 
area in October or November would probably 
be diverted in a similar manner if they 
encountered a barrage on the way (Mr. 
149 
