Structural Peculiarities and Behavior 69 



faith ; Kishi found himself in a very different predicament, 

 for he had on his hands the commonly accepted statement 

 that the animals are deaf, without being able to find any 

 structural basis for this defect. To avoid the difficulty he 

 questions the existence of deafness ! If perchance they are 

 deaf, he thinks that it is possibly because of the defect in the 

 stria vasculosa. This suggestion Kishi makes despite the 

 fact that our ignorance of the function of the stria renders 

 it impossible for us to do otherwise than guess at its relation 

 to hearing. 



We have now briefly reviewed the results of the various 

 important investigations of the behavior and structure of 

 the dancer. 



The observations of Cyon, Zoth, and the writer establish 

 beyond doubt the existence of important individual differ- 

 ences in behavior if not of distinct divisions within the species 

 of mouse, and the general results of the several anatomical 

 investigations make it seem highly probable that the structure 

 of the ear, as well as the externally visible structural features 

 of the animals, vary widely. Unfortunately, the lack of agree- 

 ment in the descriptions of the ear given by the different 

 students of the subject renders impossible any certain corre- 

 lation of structural and functional facts. That the whirling 

 and the lack of dizziness and of hearing have their structural 

 bases no one doubts, but whether it is in the brain itself, in 

 the sense organs, or in the labyrinth, our knowledge does not 

 permit us to say. With this statement Rawitz, Cyon, and 

 Alexander and Kreidl would not agree, for they believe that 

 they have discovered structural peculiarities which fully 

 explain the behavior of the dancer. Panse and Kishi, on 

 the other hand, contend that the ear gives no structural signs 

 of such peculiarities as the dancing and deafness suggest; 

 they therefore look to the cerebellum for the seat of the dis- 



