2l6 



O. C. Glaser 



The general conclusion to be drawn from these experiments is 

 that there is neither a decrease in the amount of time taken to 

 solve the problem, nor an increase in the relative frequency of 

 movements best fitted to solve it. In other words, the animals did 

 not modify their behavior in accordance with the law of resolution, 

 and consequently, so far as is objectively recognizable, learned 

 nothing. 



TABLE v 



TABLE VI 



DISCUSSION 



The facts which I have brought forward in the foregoing pages 

 agree with those of Preyer and von Uexkiill in showing that in 

 problem solving the animal repeatedly changes its behavior, not 

 persisting in a certain reaction when that is unsuccessful. If I 

 venture to take issue with Preyer, and to assert that the behavior 

 which both he and I observed does not warrant the conclusion that 

 ophiurans are intelligent, I must rest my claim upon the validity of 

 my interpretation of the facts, and this validity I shall now attempt 

 to establish. 



The behaviorof Ophiurabrevispina maybe summarized by say- 

 ing that this animal under normal conditions performs practically 

 all the movements possible to a creature constructed as it is; that 

 except for this limitation, its ordinary behavior is not predictable, 



