ON THE MIGRATION OF BIRDS. 
retire to Sweden, Poland, Prussia, Norway, and 
Lapland to breed; as soon as the young can fly, 
they return to us again; because the frosts which 
set in early in those countries totally deprive 
them of the means of subsisting; as the dryness 
and hardness of the ground, in general, during 
our summer, prevent them from penetrating the 
earth with their bills, in search of worms, which 
are the natural food of these birds. 
[The Courser and Pratincole are among the _ Courssr. 
rarest visitants of this island. | 
PRAVINCOLE. 
Every species of these two genera continue Rais anp 
with us the whole year; the Crake Gallinule ex- 
cepted, which is not seen here in winter ; it like- 
wise continues in Lreland only during the sum- 
mer months, when they are very numerous, as 
Mr. Smith tells us in the history of Waterford, 
p- 336. Great numbers appear in Anglesey the 
latter end of May; it is supposed that they 
pass over from Ireland, the passage between 
the two islands being but small. As we have 
instances of these birds lighting on ships in the 
Channel and the Bay of Biscay, we conjecture 
‘their winter quarters to be in Spain. 
ciunt, ne earum unicam quidem inter nos habitantem invenire 
possumus. Amen. Acad. IV. 588. 
Scolopaces et Glareole incredibilibus multitudinibus verno 
tempore in Polonia et Borussia nidulantur ; appropinquante au- 
tumno turmatim evolant. Klein de av. errat. 187. 
GALLI- 
NULES. 
