No. 613] INHERITANCE IN FAS TAIL PIGEON 21 



split feathers have been counted as one feather, without, 

 however, intending to prejudice the question of the single 

 or double nature of these feathers. 



The most striking cases are like those represented in 

 Fig. 14 (top row) and Fig. 15, where what appears to be 



a single feather is split in two throughout its length. 

 While there may be a complete shaft in each half, yet the 

 two vanes that lie on the " inner" side are not so broad as 

 the outer half vanes, and their edges are generally frayed 

 out and imperfectly formed. Often the vanes run across 

 and unite the two halves. 



