Strong.— Development of Color in Feathers. 



d. d. 



Pi^TE 1. 



/ 



I 



\ 



\ 

 \ 



V 



23 



20 



18 





I 



llUti 



/ 



hrbl. 



Qt 





1 



CT'-S". 





r/s. 



N^- 



-Jv 



1 /' 



9 

 *-e-rs'. 



17 



16 

 -15 



'm^-^- 



>'<!y 



V ... '4 



/ |- - - 13 



/ 



mnh inf. 



fiM.prx 



5 U 



■MS a.-^ 



