( xviii ) 
The following TABLES are divided into two Sections. The first section contains an enumeration of the Spring 
and Summer Birds of Passage. All these, with the exception of a very few, which may be called Kesident Birds 
come from the south. The greater part of them are known to build and breed in Pennsylvania. At the close 01 
the summer and in the autumn, they retire again to the south, and visit us in the Spring. 
The second section is devoted to the Autumnal and Winter Birds of Passage. These passengers may be di- 
vided into two classes : viz. I. The Spring and Summer Birds of Passage, which are now on their return to tht 
south. In strict propriety, these ought not to be considered as Autumnal and Winter Passengers : for they leave u{ 
in cold weather, either because they are incapable of supporting the severity of the winter-season, or because the;; 
cannot, during this season, procure a sufiiciency of their proper and favourite food. Perhaps, for both these causes 
II, The second class comprehends the real Autumnal and Winter Birds of Passage. These, compared with the Spring 
and Summer Birds of Passage, are very few in number. They all come from the north, and either winter with u 
or in the southern states. In the spring (frequently very early in the spring), they retire northerly, where the^ 
build, breed, and rear their young. > 
E E R A T A. 
In the Introduction, page ix. XVI. for Fringilla melodia, read Turdua Polyglottos, or Mocking-Bird. 
page ivi. XXXVI. (in a few of the copies), the last line, for uniformly, read alwai/a. 
In the Tables, page 2, for Scolopax Candida. (Plover.) read Tringa Squatarola? Grey Sandpiper? (Plover.) 
page J, for Golden-Crowned Trush, read Golden-Crowned Thrush. 
In Appendix I, page 16, under the head of Uirundo purpurea, for, when it supposed, &c. read, when it is supposed, &c 
