rruRE V. 



and furrowed on the insidi . In 



ivc.-ptaclr the lod is completely ground and 



r tin a pulp. Tin- lungs of Birds differ 



. those of quadrupeds in not being loose or 



in tin- breast, but fixed to the bones all 



tin- way down: they consist of a pair of large 



spongy bodies, covered with a membrane which 



d in several places, and communicates 



with I large vesicles or air-bags dispersed 



about the cavities of the body. 



The eyes of birds are more or less convex 

 in the different tribes j and in general, it may be 

 observed that the sense of sight is more acute in 

 birds than in most other animals - y and they seem 

 t<> possess a greater degree of power in accom- 



i at ing the convexity of the eye to any par- 

 ticular distance than other animals, for which 

 purpose they are provided with a curious ap- 

 paratus of scales round the iris or coloured part 

 of the eve not be observed in quadrupeds. Birds 

 have no outward Ear, but the internal is formed 

 on the same general plan as in quadrupeds. 



Birds as every one knows are oviparous ani- 

 mal>, ah\a\- producing Eggs, from which the 



* In the predaceoos birds or Accipitres this is wanting, the sto- 

 mach being allied to that of quadruped*. 



