BRITISH BIRDS. 



XIX 



When any column against a particular species of bird is blank, it im- 

 plies that there is little reason to expect any character or habit of the 

 species as British answering to that column ; and when it is marked by 

 the character (?) it is understood to be doubtful, and as such worthy of 

 further investigation ; the place to be sought is sometimes marked, but it 

 is, of course, only guesswork; as, where there is not positive knowledge, 

 there can be no certainty. 



