156 



GEORGE L. STREETER 



drawn through the anterior and posterior canals would meet at 

 an angle of about 95 degrees at the crus commune. This is quite 

 constant in all of the labyrinths. The lateral canal is about 

 perpendicular to the other two. At the end of two weeks the 

 planes are not so well defined as the}' are later, but when the 

 canals are otherwise normal the planes can be determined, even 

 as early as that. 



From a study of this table it will be seen that we can arrange 

 our experiments in three groups, based on the completeness of the 



TABLE 1 



LABYRINTH 

 NO. 



K ■* 



Normal group 



Abnormal group 



Doubtful group 



