THE SPARROW IN AMERICA. 73 



hour thus spent, one of the birds is observed to leave 

 the vine, and by a given signal, so loud as to be dis- 

 tinctly heard by all", commands silence. The order is 

 instantly obeyed, and quietness reigns supreme. Mr. 

 Ivenney assures me that he has seen the movements, 

 and heard the call, on scores of occasions, and cannot 

 be mistaken. 



