344 UNITED STATES. 



and Summer birds, which are now on their return 

 to the south; the second comprehends the real Au- 

 tumnal and Winter birds of passage : these, com» 

 pared with the Spring and Summer birds, are very- 

 few in number. They all come from the norths 

 and either Winter with us, or in the southern Stateso. 

 In the Spring they return to the north, where they 

 breed and rear their young. 



The resident birds of Pennsylvania amount to thir- 

 ty-nine: but Dr. B. justly remarks, that many of 

 these birds migrate to the south in very cold Win- 

 ters. 



For a particular list of the birds of Pennsylvania^., - 

 the reader is referred to Dr. Barton's work, before** 

 mentioned ; for those of the other parts of the UnioR|, 

 the histories of the different States may be consult^- 

 ed.* A list of most of the birds may be seen in Dro> 

 Morse's American Geography,! 



" Birds, in migrating, are fond of following the 

 course of rivers, and other large streams of water» 

 This circumstance, in my opinion, partly explains 

 the reason, why some of the birds of the southern 

 parts of the United States, and also some of the South 

 American birds, which have never, or very rarely^ 

 been discovered in the Atlantic countries of North 

 'America, are not uncommon in the countries west of 

 the Alleghany mountains. These southern birds 

 following the courses of the Mississippi and its 

 branches, (the Ohio, the Illinois, &c.) are spread or 



* Viz. Drayton's View of South Carolina. Belknap's Hist, of 

 ?^ew Hampshire. WilUams^s Hist, of Vermont. JeiFerson-s Notes 

 on Virginia. 



t Boston, 1805, 



