GENERATION OF ANIMALS, V. i. 



well as in waking hours, and this includes not only 

 what we call dreams but something more besides ; 

 thus persons who get up while they are asleep do 

 quite a number of things A^ithout dreaming at all. 

 There are those who get up while asleep and walk 

 about and can see as well as anyone awake. The 

 reason is that they are aware through their senses of 

 what is going on, and though they are not awake, 

 still this awareness is different from that of a dream. 

 Infants, it would seem, have not yet acquired the art 

 of being awake, if we may put it so, and thus both 

 their sensations and their life go on during their sleep 

 by force of habit. As time wears on, and the scene 

 of their growth shifts its ground to the lower parts 

 of the body, at this stage they wake up more and 

 spend the greater part of their time awake. To 

 begin with, however, infants spend more time asleep 

 than any other animal, because they are born in a 

 more imperfect condition than any other perfected •* 

 animal and have made their advance in growth chiefly 

 in the upper part of the body. 



The eyes of all infants are bluish immediately after Colour of 

 birth ; later on they change over to the colour which ^■^' 

 is going to be their natural colour for hfe. In the 

 other animals this does not occur noticeably, and the 

 reason is that their eyes exhibit more singleness of 

 colour : thus, cattle have dark eyes ; all sheep have 

 palUd ^ eyes ; another class of animal ^^•ill all have 

 greyish-blue, or blue, eyes ; some have " goat's- 

 eyes," '^ as indeed the majority of goats themselves 

 have. The eyes of human beings, however, show 



fissipede animals, such as the dog, produce them " imper- 

 fect," e.g., they are born blind. 



^ Lit., " watery." ' i.e., yellow. 



