XIV 



Journal of Comparative Neurology. 



olive. It shows further the tract of Duval and Laborde which puts 

 into direct connection the abducens of one side and the nidus of origin 

 of the fibres of adduction [oculo-motor fibres] of the opposite side, 

 thus providing the mechanism of the conjugate movements of the eye- 

 balls in the horizontal plane, and also the connection via the dorsal lon- 

 gitudinal fasciculus between the sixth nidus and the fourth and third. 



Accom, distance. 

 Accom. intensity. 

 Additction. 



Elevation. 

 Depression. 

 Lid. 



Inferior oblique. 

 __^. . — Superior oblique, 



N. Bechterew. 



N . internus. 

 N. Deiters, 



Abducens . 

 Superior olive. 

 VIII nerve. 



Now the author seeks to correlate these anatomical facts with the 

 results of some experimental work and a large series of clinical obser- 

 vations. De Cyon first called attention to the oculo-motor disturbances 

 associated with lesions of the labyrinth, a fact with which all experiment- 

 ers on the labyrinth have been forcibly impressed. The most frequent 

 phenomenon is nystagmus, though all disturbances may be met for they 

 are all observed in the clinic. 



De Cyon was of the opinion that the directions of the oscillations 

 of the eyeball were determined by the choice of the canal excited. 



