Behavior: Equilibration and Dizziness 49 



the dancers observed by him became fairly normal in their 

 behavior. They moved about somewhat more slowly than 

 usually, especially when in a position which required accu- 

 rately coordinated movements. He therefore fully agrees 

 with Alexander and Kreidl in their conclusion that vision is 

 not so important for the guidance of the movements of the 

 dancer as Cyon believes. 



In summing up the results of his investigation of this 

 subject Zoth well says (31 p. 168), "the orientation of the 

 positions of the body with respect to the horizontal and verti- 

 cal planes seems to take place without the assistance of the 

 sense of sight." And, as I have already stated, this excellent 

 observer insists that the ability of the dancer to place its 

 body in a particular position (orientation), and its ability 

 to maintain its normal relations to its surroundings (equili- 

 bration) are excellent in darkness and in daylight, provided 

 only the substratum be not too smooth for it to gain a foot- 

 hold. 



It must be admitted that the contradictions which exist 

 in the several accounts of the behavior of the dancer are too 

 numerous and too serious to be explained on the basis of 

 careless observation. Only the assumption of striking in- 

 dividual differences among dancers or of the existence of 

 two or more varieties of the animal suffices to account for 

 the discrepancies. That there are individual or variety 

 differences is rendered practically certain by the fact that 

 Cyon himself worked with two groups of dancers whose 

 peculiarities he has described in detail, both as to structure 

 and behavior. 



In the case of the first group, which consisted of three in- 

 dividuals, the snout was more rounded than in the four 

 individuals of the second group, and there were present on the 

 head three large tufts of bristly black hair which gave the 



