[43] 



is coramou, e.g. Meadow Pipit. But it must be admitted that this view is 

 open to criticism similar to that suggested above. As regards the foster 

 species considered in this paper, all that the evidence may safely be claimed 

 to show is that while a bias towards a particular haunt, e.g. a river bank, 

 may be exhibited by a Cuckoo, the choice of species for foster 

 parents within that haunt would appear to be determined more by the 

 frequency of occurrence of its nests, or the facility with which the 

 nests are discovered by the Cuckoo, than by any hereditary bias towards 

 a particular foster. 



Literature Cited. 



1. BaluaMus, a. C. E. Das Leben der europaischen Kuckucke, Berlin, 1892. 



2. Herrick, Francis H. Jour. Exp. Zool., 9, 1910, p. 169. 



3. Latter, O. H. Biometrika, vol. 4. 



4. Newton, A. Dictionary of Birds. 



{Issued separately, lith February 1914.) 



