128 Observations on Periodical Birds. 
where I have placed them, for the same rea- 
son; and perhaps it would be more correct 
to class the pied and yellow wagtails with 
the summer birds, and the grey wagtail with 
the winter birds; though the pied species is 
frequently seen in winter, even in the north- 
ern counties, when the season is mild. 
The remarks cousist chiefly of details of 
such circumstances as have fallen under my 
own observation, and of conclusions drawn 
from them, and from an attentive consider- 
ation of the facts recorded by others, 
TABLES 
Various Species of Periodical Birds observed in 
the Neighbourhood of Manchester. 
Tue periodical birds may with propriety 
be arranged under four distinct heads. 
Ist. The summer birds, or those species 
that appear during the spring months and 
retire in autumn. 
2d. The winter birds, or those species that 
appear during the autumnal months and 
withdraw in spring. 
3d. Those birds that are irregular in the 
times of their appearance and disappearance. 
