94 REPORT ON THE MIGRATION OF BIRDS. 



spreading out the migration again, or at least has not deflected 

 it to the same extent ; and also, the effect of causing birds to 

 migrate at greater elevations, and, where the gales have been 

 most severe, to bear them away above the range of vision and 

 carry vast numbers out to sea, until, weary and exhausted, they 

 have ceased to be able to guide themselves, and again, involun- 

 tarily, lowered, to be picked up senseless and stunned on board 

 the ships, or to perish in thousands in the ocean. And lastl}^ 

 we have hinted at the wideness of the migratory waves depending 

 upon the pressure at the starting-points, or upon the larger 

 north and south area occupied in the breeding- season of 1880, 

 besides some other minor details. 



