THE UNCHARTED SKY 123 



garding birds, not only federally but also for the 

 several states. You can see for yourself that this 

 would not be possible unless it were definitely 

 known what birds were to be found in a certain 

 state and at what season of the year. We have 

 also done a great deal toward the passing of the 

 Migratory Bird Law, which protects our game 

 birds and song-birds. We have also enabled the 

 drawing up of treaties with Canada to the same 

 end. 



''For twenty-five years, experts of the Biological 

 Survey have worked on this question of Bird 

 Migration. Our field naturalists have traveled the 

 North American continent, from Panama to the 

 Arctic Circle. They have pursued their studies 

 on the Seven Seas. A number of other govern- 

 ment bureaus cooperate with us in the work. For 

 over twenty years regular reports have been re- 

 ceived from lighthouses and lightships regarding 

 the passage of migrant birds. We have hundreds 

 of experienced volunteer observers scattered over 

 the country, men who know birds and their habits 

 thoroughly, and these also send in to us complete 

 and careful reports." 



He turned to the boy. 



"There is not a corner of the United States 



