282 



TRESPASSERS UPON THE AIE. 



responds with the fore arm of man. Any one can 

 examine this structure by stripping the feathers and 

 skin from the wing of a fowl before it is cooked. 



In the Bat, however, the foot, instead of being 

 flattened and crushed into a mere support for the 

 feathers, is developed in a most extraordinary manner, 

 the most being made of every joint. The accom- 

 panying figure, will explain this structure at a 

 glance. 



SKELETON OF VAMPIKE BAT. 



Each portion of the limb is greatly elongated, 

 while the toes are so long and so delicate, that they 

 look as if they had been passed through a wire- 

 drawing machine. The great toe, or thumb, is the only 

 one which is not elongated, and it is furnished with a 

 sharp, curved claw, by means of which the Bat is able 

 to draw itself along a level surface whenever it wishes 

 to walk. 



There is another point about the skeleton of the 

 arm, which assists materially in enabling the Bat to 



