32 C. WINKLER. THE CENTRAL COURSE 



towards the ground, resting on the atonic foreleg of that -side which 

 has been shoven forward, whilst the opposite fore-leg is hyper- 

 extended and abduced. Only the revolutions have ceased. 



With its twisted head however the animal continues to provide 

 in all its habitual wants. It is eating, exerting coition, righting 

 with other animals, and does not give the impression of being 

 dizzy, or of turning its head in order to compensate a sensation 

 of dizziness. 



If eventually in periods of rest, when left entirely to itself the 

 animal is lifting its head, the orbital fissure on the operated side 

 is opened somewhat wider, and the eye is no longer turned so far 

 downward in the nasal corner as it was directly after the operation. 

 The eye on the opposite side is likewise turned less far dorsal ward. 



When an animal has got into this stage, and is able again So 

 sit on its four legs, we can try to put the head straight. A vigorous 

 exertion is needed to do this. The animal offers violent resistance, 

 but with some difficulty it may be done. If the head, after having 

 been kept straight in this manner, is suddenly left free, it falls 

 back with a vigorous jerk. It may even occur, that a single revo- 

 lution reappears by this experiment. 



Of even more importance is the fact, that with an animal in 

 this stage, the deviation of the eyes, having also diminished some- 

 what already , at once become maximal, when the head is put straight. 

 This position of the eyes lasts as long as the head is kept straight, 

 sometimes the eyes relaxate, and in that case they are brought 

 back into maximal deviation by a sudden shock, nystagmus is seen. 

 These strokes of nystagmus often succeed one another with regular 

 intervals. 



The deviation of the eyes is therefore doubtlessly connected 

 with the turned position of the head, in such a manner that the 

 head follows the position of the eyes, this latter showing itself 

 more plainly, if the head is prevented from following the eyes. 



Evidently the eye on the operated side has assumed the most 

 evident deviation, the opposite eye rather following the former. The eye 

 on the operated side (see fig. 6 and 7) is drawn downward and 

 nasal ward. The head is following exactly the movements of this eye. 



The neck being turned into the frontal plane, and the head being 

 turned into a plane standing vertically on the former, the head 

 follows the direction indicated by the turning of the eye on the 

 operated side. Therefore the impression seems justified, that the 

 involuntarily assumed position of neck and head is a movement made 

 in compensation to the curious turning of the eye on the operated side. 



