50 



THE MYOLOGY OF THE RAVEN, 



fact, however, to be kept before us is, that as the form 

 and tension of its walls vary, the tympanic mcml)rane 



Fig. 19. — Author's ski'tcli of Lis dissection of the iiinscnlaturo of the; .lir 

 passages of a Raven. Shown life-size upon hiteral aspect, cp., de- 

 tached portion of the costal process of the stevnuni, of the right side, 

 and turned about. 



which stretches across the mesial aspects of the bronchi, 

 upon the vibrations of which the voice of the bird 



