118 THE MIGRATION OF BIRDS 



a bird with short rounded wings like those of the 

 corncrake, which had struck the lantern of a light- 

 house with great violence. Its smashed head was 

 nearly severed from its body. 



Herr Otto Herman's ' Recensio critica auto- 

 matica '' (31) supplies much information about the 

 literature on bird migration, and the strange diver- 

 gence of opinion on nearly every point. It is carried 

 up to the beginning of the twentieth century, but 

 much of the valuable work done in America is alto- 

 gether neglected. 



A short bibliography is given at the end of the 

 present volume, including the more important works 

 on the subject and a few of the papers in periodical 

 publications referred to in this manual. 



