MOVEMENT OF ANIMALS, vii. 



elusions by questioning," so here the mind does not 

 stop and consider at all one of the two premisses, 

 namely, the obvious one ; for example, if walking is 

 good for a man, one does not waste time over the pre- 

 miss " I am myself a man." Hence such things as we 

 do without calculation, we do quickly. For when a 

 man acts for the object which he has in view from 

 either perception or imagination or thought, he 

 immediately does what he desires ; the carrying out 

 of his desire takes the place of inquiry or thought. 

 My appetite says, I must drink ; this is drink, says 

 sensation or imagination or thought, and one 

 immediately drinks. It is in this manner that animals 

 are impelled to move and act, the final cause of their 

 movement being desire ; and this comes into being 

 through either sensation or imagination and thought. 

 And things which desire to act, at one time create 

 something, and at another act, by reason either of 

 appetite or of passion, or else through desire or wish. 

 The movement of animals resembles that of 

 marionettes which move as the result of a small 

 movement, when the strings are released * and strike 

 one another ; or a toy-carriage Λvhich the child that 

 is riding upon it himself sets in motion in a straight 

 direction, and which afterwards moves in a circle 

 because its Λvheels are unequal, for the smaller Avheel 

 acts as a centre," as happens also in the cylinders.'' 

 Animals have similar parts in their organs, namely, 

 the growth of their sinews and bones, the latter cor- 

 responding to the pegs in the marionettes and the 



^ The marionettes seem to have been worked by means of 

 cylinders round which weighted strings were wound, the 

 cylinders being set in motion by the removal of pegs. 



463 



