XCV1 



PROLEGOMENA 



valued assistance in dissecting the bodies of the two Polish 

 Swans mentioned on p. 252. It appeared to us that both these 

 examples showed a marked divergence of structure from the 

 Mute Swan. I allude to the method by which the trachea is 





Trachea of Polish Swan. 



inserted into the thoracic cavity. The trachea of the Mute 

 Swan enters the body without any contact with the furculum. 

 The tracheae of the two Polish Swans passed downwards below 

 the furculum, then turned upwards, and, ascending through the 



