ENGLISH BIRD-LIFE 415 



this cause of high mortality and that occasioned by winter 

 storms, environmental conditions in America are too unset- 

 tled or at best are too recently settled for us to have witness- 

 ed that essentially final adjustment between he bird and the 

 sum total of its surroundings, such as we observe in Eng- 

 land. 



Our Bobin, or Migratory Thrush, as our English cousins 

 call it, appears, however, to have established satisfactory 

 relations with the world as it finds it and is as preeminently 

 a success in bird-life as its English representative, the Song 

 Thrush. 



Let us hope that with other species, also, we may be able 

 so to control the selective and determining processes which 

 are now shaping the America of succeeding generations, 

 that those who come after us will lose no part of their rich 

 heritage in bird-life. 



