338 



ANATIDJl. 



the change in the colour of the feather going on by slow 

 degrees afterwards. As late as the middle of January, 

 young males of the previous summer had not attained their 

 perfect plumage ; and Dr. Fleming mentions that the 

 black on the breast of the young males does not make its 

 appearance during the first year. 



The trachea of the male is about eight inches in length, 

 the diameter of the tube large, tapering suddenly towards 

 the bottom ; the labyrinthic tympanum of beautiful form ; 

 the bronchial tubes short. The engraving below repre- 

 sents the surface opposed to the left side of the bird. 



