BATS. 



tail controls the web connecting the hind-legs, which acts as a 

 rudder in flight and as a net helping to capture and retain the 

 larger insects upon which the Bat lives. 



The permanent teeth which are quite different from the 

 milk-teeth vary in the different species, but they always have 

 distinct roots, and in the British species the upper surface 

 always runs into points or cusps, suited for cracking the 

 chitinous shells of beetles. 



The Bat's brain is considered to be of a low order ; yet its 

 senses are very acute. Spallanzani, in the latter part of the i8th 

 century made a number of experiments on Bats, depriving them 



5C 



Skeleton Of Bat (Vespertilio). 



of sight, smell, and hearing, and observing their behaviour under 

 such conditions. He found that when released in a room across 

 which he had stretched numerous threads to block their flight, 

 they in every case avoided these, even when directly in their 

 course. They appear to be helped in this matter by the sensitive 

 whiskers around the muzzle, as well as by the delicate membranes 

 constituting the wings and the outer ears. In the Horse-shoe 

 Bats there is also a great development of the appendages to the 

 nose, known as the nose-leaf, which act as delicate organs of 

 special perception. 



In most of the genera there is considerable development of the 

 ear as compared with other mammals. The little lobe that 

 guards the entrance to the ear in the human subject, and is 

 known as the tragus, is much elongated in the Bats so that it 



Known 



