THE MIGRATION OF BIRDS 



Watching for the annual appearance of the first indi- 

 vidual of each species is most fascinating occupation. 



Note. — Government bulletins on the migration of 

 various North American birds may be obtained free, or 

 at slight cost, by addressing H. IV. Hensbaw, Chief 

 Biological Survey, Department of Agriculture, Wash- 

 ington, D. C. 



[81] 



