156 COMPARATIVE PHYSIOLOGY OF THE BRAIN 



occur after destruction of one half of the supracesoph- 

 ageal ganglion. In Cephalopods von Uexkull has 



observed forced 

 movements 

 lesion of an 



FIG. 36. 



Fig- 



after 

 ear. 



36 shows the 

 predominance of 

 the flexors of the 

 legs over the ex- 

 tensors on the left 

 side of the body of 

 a Limulus. In this 

 animal the right 

 half of the brain 

 had been de - 

 stroyed and it 

 showed circus-mo- 

 tions toward the 

 left. 



Steiner has made 

 a peculiar applica- 

 tion of the facts of 

 forced movements. 

 He imagines that 

 the ability to move 

 forward is a spe- 

 cific "function" of 

 the brain, and has believed that it would be possible by 

 means of this criterion to decide whether or not a gan- 

 glion of a lower animal should be called a brain. The 



