i86 



OUR SUMMER MIGRANTS. 



The spring tide of migration appears to set 

 in along the entire coast-line of the Mediterra- 

 nean, and in a direction almost due north. I do 

 not remember to have seen any record of the 

 occurrence of the Martin on the west coast of 

 Africa, although there seems to be no reason 

 why it should not accompany the Swallow there 

 in winter. 



Both species will rear two broods in a season ; 

 and this fact, doubtless, will account for the pro- 

 longed stay in autumn of the later fledged birds, 

 which are not sufficiently strong on the wing to 

 join the main body of emigrants at the usual 

 time of their departure. 



