PLUMAGE 



497 



Gannet examined, but it certainly was in the second, which 

 was a bird about seventeen months old. 



The spinal tract of feathers is very well defined in a 

 Gannet, extending along the vertebral column to the tail. 

 On both sides it is bordered by large featherless spaces, 



NO. ]. THE VENTRAL ASPECT, 



NO. 2. THE DORSAL ASPECT. 



which reach as far as the wings, and in the other direction 



almost to the vent, as shown in the drawing. Both the 



spaces and the tracts are easily traceable from the 



inside of the skin. 



1 1 



