BIBDS. 



287 



the quills of the feathers. In the case of a wounded Heron, 

 respiration was carried on for an entire day through a broken 

 portion of the wing-bone.* 



Covering. — Feathers, the peculiar and appropriate vesture 

 of birds, present every variety of texture and of tint that the 

 eye could desire, and far more than the imagination could 



Lingual artery. 



Trachea. 



External carotid arterj-. 



Carotid artery. 



A orta. 



Ttcnal 

 artery. 



Ischiatic 

 arterj-. 



Subclavian 

 artery. 



jNIammary 

 artery. 



Femoral 

 arterj'. 



Sacral artery. 



Fig. 241. — Arterial System of a Bird. 



conceive. We see them in the Eagle compact and firm, in 



the Ostrich loose and curling, in the Penguin reduced to rudi- 



* Linnaean Transactions, voL xi. p. 11. 



