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OBSERVATIONS 



OF THE 



NATURAL HISTORY 



OF 



SWALLOWS; 



COLLATERAL STATEMENT OF FACTS 



RELATIVE TO THEIR 



MIGRATION, AND TO THEIR BRUMAL TORPIDITY: 



AND 



A TABLE OF REFERENCE TO AUTHORS. 



ILLUSTRATED WITH 



FIGURES OF FIVE SPECIES, 



ENGRAVED ON WOOD, BY WILLIS. 



TO WHICH IS ADDED, 



A GENERAL CATALOGUE OF BRITISH BIRDS, 



With the Provincial Names for each, c. fyc. fyc. 



BY THOMAS FORSTER, F.L.S. 



Coiresp. Memb. Acad. Nat. Sciences at Philadelphia, &c. &c. &c. 



SIXTH EDITION, ENLARGED, 



LONDON : 



PRINTED FOR T. AND G. UNDERWOOD, SC, FLEET STREET; BALDWIN, 



CRADOCK, AND JOY, PATERNOSTER ROW ; AND TREUTTIiL AND- 



WURTZ, AT PARIS AND STRASBOURG* 



1817- 



