.'ii)G RliPoRT ON THE ISIIGlfATION OP BIIiDR. 



learii souiething from the practical methods of the otliers. The maimer 

 of representation will then develop of its own accord. 



In conclusion, it is hardly necessary to call attention to the fact that 

 a very inviting field of inquiry, in the same direction as tliat entered 

 upon hy Prof. Cooke in America, is open to those ornithologists who 

 are sufliciently versed in practical meteorology. It is however to be 

 foreseen that the phenomenon will be much more complicated in Eu- 

 rope, and that for this reason the investigation is to be commenced witli 

 those species whose routes have already been fixed geograpliically with 

 some degree of certainty. 



