— 
Strong. — Development of Color in Feathers. 
PEALE 9: 
Photomicrographs. 
Fig. 41. Transverse section of green-feather germ from Passerina ciris, showing | 
pigmentation completed and cornification nearly so. X 167. 
Fig. 42. Transverse section of wing-feather from the “homer” pigeon, showing 
differentiation and cornification completed. > 69. 
