ADVERTISEMENT. 
THE accompanying sheets of a Revision of the Birds of North 
and Middle America, by Prof. S. F. Baird, are distributed by the 
Smithsonian Institution in advance of the completion of the whole 
work, with the view of eliciting criticisms and suggestions from Orni- 
thologists and Naturalists. Any remarks or corrections which may 
tend to make the work more accurate and reliable, as well as speci- 
mens of species not mentioned therein, or from localities other than 
those indicated, will be thankfully received by the Institution. 
JOSEPH HENRY, 
Secretary S. I. 
SMITHSONIAN INstTITUTION, — 
Wasuineton, 1864. 
PHILADELPHIA: 
COLLINS, PRINTER. 
