34 



C. WINKLER. THE CENTRAL COURSE 



A farther support to this opinion is given by the fact that both 

 the deviation of neck and head, and that of the eyes, cease directly 



after the removal of the 

 second labyrinth. 



4. The disturbances of 

 motion in rabbits after 

 the extirpation of the 

 labyrinth on both sides. 



No result of any ope- 

 ration can be more stri- 

 king than the result, 

 following immediately 

 on the removal of the 

 second labyrinth, when 

 this operation is made 

 some weeks or months 

 after the removal of the 

 first labyrinth. 



The animal, before 

 being operated , bears 

 its head obliquely, it 

 presents the involuntarily 

 assumed position of the 

 eyes, the abduced-exten- 

 ded position of the oppo- 

 site fore-leg, the atony 

 of the homolateral extre- 

 mities, but after the 

 second operation it has 

 become quite another 

 animal (see fig. 15). 



The oblique position 

 of the head the tur- 

 ning of head and neck - - is suddenly changed. The animal bears 

 its head straight. But in order to do this, its forelegs are widely 

 extended (see fig. 15 B C). The head is unsteady. It is hanging 

 downward (see fig. 15 B). 



Besides now and then fits occur, in which the head is thrown 

 abruptly backward. The animal then staggers (see fig. 15 C). 

 The eyes are standing straight in the head. The orbital fissure 



Fig. 15. 



Copies of photo's. 



A. A rabbit after removal of the left labyrinth. 



B. The same rabbit after removal of both labyrinths. 



C. The same rabbit staggering. 



