188 POLISH SWAN. 



"In the adult bird," according to Yarrell, "the beak is reddish orange; the nail, 

 lateral margins, nostrils, and base of the upper mandible, black; the tubercle, even in 

 the old male, of small size; the irides, brown; the head, neck, and the whole of the 

 plumage, pure white; legs, toes, and intervening membranes, slate gray." 



In length, it measures about four feet nine inches. 



The trachea resembles that of the Mute Swan. 



