THE SENSES 583 



turns somersaults, the head is twisted, the eyeballs roll from 

 side to side, and special measures have to be taken to prevent 

 the creature killing itself through its own violence. These 

 violent symptoms pass away in due course, and the animal is 

 able to stand and walk, though the process has to be learnt. 

 Vision here gives the sense of direction and spatial relationship, 

 for if the eyes be covered farther progress is impossible. 



