Structural Peculiarities and Behavior 57 



FIGURE 9. The membranous labyrinth 

 of the dancer's ear. Type II. 



he examined the structure of the ears of these mice, Rawitz did 

 find, according to his accounts, two structural types between 

 which very marked differ- 

 ences existed. Were it not 

 for the carelessness which is 

 indicated by the confusion of 

 the materials, and the influ- 

 ence of Cyon's suggestion 

 that there should be different 

 structures to account for the 

 differences in behavior, Ra- 

 witz's statements might be 

 accepted. As matters stand 

 there can be no doubt of in- 

 dividual differences in behavior, external appearance, and the 

 structure of the ear ; but until these have been correlated on the 



basis of thorough- 

 going, careful ob- 

 servation, it is 

 scarcely worth 

 while to discuss 

 their relations. 



To his previous de- 

 scription of the con- 

 ditions of the ear 

 sacs, sense organs, 

 and nerve elements of the dancer's ear, Rawitz adds nothing 

 of importance in his second paper (26 p. 171). He merely 

 reiterates his previous statements concerning the form of the 

 canals, on the basis of his findings in the case of six additional 

 dancers. Figures 8, 9, and 10 are reproduced from Rawitz to 

 show the anatomical conditions which he claims that he found. 

 As these figures indicate, the canals were found to be extremely 



C.p:. 



FIGURE 10. The membranous labyrinth of the 

 dancer's ear. Type III. 



