a 
O “ summer . 
GO 
WZ 
pethaps, the most generally familiar. It 
visitors”? the Swallow is, 
reaches our shores in relays, the first of which generally 
make their appearance about the 11th or 12th of April; and 
within a couple of weeks it may be seen in all parts of the 
country. From the first thing in the morning until long 
after sunset it is engaged in its tireless flight, sometimes 
soaring high in air, sometimes skimming only a foot or two 
above the surface of land or water, but always in pursuit of 
its insect victims, which it engulfs in its open beak as it 
darts by. For five months or more it is plentiful everywhere. 
Then some mysterious summons goes out; the birds con- 
gregate in large flocks in certain appointed meeting-places, 
