A UDITORT PERCEPTIONS. 555 



in each ear we can localize sounds better than if the head be 

 kept motionless. The large movable concha of many ani- 

 mals, as a rabbit or a horse, which can be turned in several 

 directions, is probably an important aid to them in de- 

 tecting the position of the source of a sound. That the 

 recognition of the direction of sounds is not a true sensation, 

 but a judgment, founded on experience, is illustrated by the 

 fact that we can estimate much more accurately the direc- 

 tion of the human voice, which we hear and heed most, 

 than that of any other sound. 



