236 



EVOLUTION OF BIRD- SONG 



Of the musical intervals in alarm-cries I have 

 recorded none but a few varieties of the blackbird's 

 alarm. The following are three " alarms >: which 

 were heard at places about a mile apart : 



4! S_^ S (S- 



> 



^ 



:*^zz: 



:*==*: 



& P 



The music of the hedge -accentor, like that of 

 the robin, is rapid and difficult to follow. The 

 three strains next recorded give a general idea of 

 the song : 



~N- 



Ft 



:*-^*: 



:*r= 



The blackcap is another rapid singer. The first 



