ON THE MIGRATION OF BIRDS. 
any of them, excepting of the lesser Guillemot 
and black-billed Auk, which, during winter, 
visit in vast flocks the Frith of Forth. 
These chiefly breed in the lakes of Sweden 
and Lapland, and some in countries nearer the 
Pole;* but some of thet red throated Divers, 
the northern and the imber, may breed in the 
north of Scotland and its isles. ; 
Iam uncertain where the black toed Gull 
breeds. The Skua is confined to the Shetland 
Isles, the Rock Foula, and perhaps St. Kilda. 
The Arctic breeds in the Orknies and in the 
Hebrides. The rest of the tribe breed dispers- 
edly on all the cliffs of Great Britain. The 
black headed on our fens and lakes. 
Every species breeds here; but leaves us in 
the winter. : 
The Fulmar breeds in the isle of St. Kilda, 
and continues there the whole year, except Sep- 
tember and part of October; the Shearwater 
visits the Isle of Man in April, breeds there, 
and leaving it in August or the beginning of 
September, disperses over all parts of the dé- 
lantic Ocean. The Stormfinch is seen at all 
* Faun. Suec. No. 150. Crantz, Greenl. T. 82. 83. 
+ Barry, in his History of the Orkneys, p. 304, says that this 
species builds on a bank of a lake in Hoy, and in other places. 
Ep. 
~ The Sandwich Tern may perhaps be an exception. Ep. 
391° 
Divers. 
GULLS. 
TERNS. 
Perre.s. 
