2/8 HARRY DEAL TORREY AND BENJAMIN HORNING. 



FIG. i. White Leghorn male about 8 weeks old, with normal rectrices On 

 the extreme right is a rectrix of the first set; all the others are of the second set. 



Normally the first or infant rectrices may drop away without 

 urging from below; or they may be pushed out by the seconds 

 that are developing from the same follicles. In neither case, 

 however, are the two continuous. Though the succeeding 



