(125) 
Fables 
THE VARIOUS SPECIES 
OF 
PERIODICAL BIRDS 
OBSERVED IN THE 
Neighbourhood of Manchester : 
UUith a few remarks 
TENDING TO ESTABLISH THE OPINION THAT THE 
PERIODICAL BIRDS MIGRATE, 
ns 2s — 
BY MR. JOHN BLACKWALL. 
—_—v sree 
(Read before the Society Jan. 21, 1822.) 
AN accurate and comprehensive history of 
the periodical birds may now be considered 
as one of the greatest desiderata in ornitho- 
logy. Hitherto, little has been done to elu- 
cidate the habits, manners, and economy of 
this interesting portion of the feathered 
tribes, as connected with their periodical 
appearance and disappearance ; for although 
much has been written on the subject, few 
facts of any considerable importance have 
been ascertained; and even these few lie 
