OF THE NERVUS OCTAVUS 



35 



on the opposite side is narrowed , that on the operated side is 

 widened by the second operation. There is no longer any devia- 

 tion of the eyes (see fig. 16 A before and B after the second 

 operation). On both sides however there is distinctly protusio bulbi , 

 and the movements of the eyes are performed by strokes of nystagmus. 



Peculiarly striking is the position of the back, it presents no 

 longer a convex curve, as in the normal animal, on the contrary 

 it is sunken in , and cannot assume the former rounded position again 

 (see fig. 17). 



Only with difficulty the animal is able to maintain itself on its 

 four legs, that are placed in a singular position under the body. 



Fig. 10. 



A. Position of the contra-lateral (left) eye after removal of the right labyrinths. 

 B. Position of this eye after removal of both labyrinths. 



This latter is sunken in. At every moment it is slipping and there 

 exists a great laxity of all extremities. The rabbit does no longer 

 jump, it is creeping and faltering, and moves difficultly. Still it 

 does not roll. In the lower extremities the atony is very strong , 

 likewise in the fore-legs. The abduced-extended position has vanished. 

 In order to maintain its equilibrium, the animal keeps its forelegs 

 wide-extended. It does no longer react on sound-impresssions, and 

 I could never keep them alive for more than two or three weeks 

 after the second operation. 



The results of the removal of the labyrinth on both sides are 

 apt to support the opinion , that the symptoms of one-sided extir- 

 pation - the turning of head and neck and the deviation of the 

 eyes-are connected symptoms, and that the rollings around the longi- 

 tudinal axis are dependent on the turning of head and neck. But 

 above all the results of the operation on both sides seem to prove 

 that after the removal of the labvrinth on one side a one-sided 

 spasrn prevails, caused by destruction of innervations on the operated 



3* 



