WINTERING OF SWALLOW TRIBE IN S. HANTS. 271 



A short sea passage would be safer than a long one, and, besides, 

 the advantages the birds would obtain by crossing a larger land 

 area, by being able to stop if necessary to feed,- cannot be over- 

 looked when considering the matter whether a N.W. or N.E. 

 wind is the more suitable for migration. 



Without going through the table in detail, it will be seen that 

 there were four days, from Nov. 25th to the end of the month, 

 when the instinct of migration — whatever that may mean — could 

 have been taken advantage of, but the birds did not for some 

 inscrutable reason follow their instincts, but delayed their de- 

 parture, or, as it seems to me, were quite content to remain, the 

 reason for which I shall discuss later. 



(To be continued.) 



