132 OTOLITH ORGANS AND SEMICIRCULAR CANALS 



4. It is pointed out that these observations do not justify the 

 theory of Mach and Breuer that the ampullae and semicircular canals 

 are the organs for the dynamic functions of equiUbrium, and that the 

 otoliths are the organs for the static functions of equiHbrium. 



5. The new experiments recorded in this paper show that the 

 ampullae alone (without the otohths) suffice for all the dynamic and 

 all the static functions of equilibrium of the ear; and that the otoHth 

 organs (without the ampullae) suffice for all the static and for all the 

 dynamic functions of equihbrium of the ear with the exception of the 

 response to a rotation of the animal in a horizontal plane. 



