625 



Animal in ventral position ; horizontal nystagmus to the left side. 



Animal : vertical, head down, horizontal and rotatory nystagmus 

 to the right side. 



Extirpation of left labyrinth under jiareosis of ether ; operation 

 finished at 11.15. 



11.45. Spontaneous nystagmus to the right side in all positions. 



11 

 . . Ill 



Ventral position, frequency per 10 seconds ii . 



12 



Head down, frequency per 10 seconds 



14 

 15 



15 . 



18 



16 



12.10. A flow into the right meatus. 



In ventral position, nystagmus to the right side lessens considerably; 

 we did not succeed, however, in removing it altogether. 



End. kead down : nystagmus to the right side (horizontal -[- rota- 

 tory) grows much stronger and rapid. Now the frequency per 



124 

 23 

 25. 

 23 

 24 



5.15. Spontaneous nystagmus to the right side in all positions. 



112 



Ventral position : horizontal nystagmus, frequency per 10 sec. ii. 



Head down: horizontal + rotatory nyst.; frequency per 10 sec. le 



A flow into right meatus. 



Ventral position : eyes perfectly quiet. O.S. distinct downwards 

 deviation. 



Head down-, strong horizontal rotatory nystagmus to the right side, 



24 

 23 



frequency pei- 10 sec. 22. 



22 



Again in ventral position eyes perfectly quiet. 



5.30 extirpation of labyrinth on the right with ether-spray. 



8.30 not the slightest indication of nystagmus. 



It then appeared from this experiment (and the othei- ex[)eriments 

 were conducted in the same way) that after bilateral extirpation of 

 the labyrinth there was no nystagmus, after a unilateral extirpation 

 there was a spontaneous nystagmus which could not in all directions 

 be arrested by a flow into the meatus of the untouched ear. From 



