643 



by Oppenhkim will be found in general, viz. liis second form of 

 cerebellar ataxia. 



Should the vestibular tract be hurt, then the description of 

 DÉGÉRINE conies right. If there is an interruption of both the paths 

 or if the disturbance of the paths from the right and from the left 

 side commences more or less simultaneously, then perhaps the gait 

 of the drunken man will become more prominent. 



If the results of the animal experiment are compared with those 

 found iji man, then we may say that the cerebellar ataxia does 

 not always show the same aspect and that this can be explained 

 by the fact, that the cerebellum possesses more than one afferent 

 tract, whose interruption causes disturbance in its course and that 

 according to the suffering of the one or the other or more paths, 

 the aspect will change. 



The third question is to explain in cerebellar disturbance the fact 

 how the equilibrium sensation of the upper limbs can totally 

 compensate the ataxia, because one may accept that its equilibrium 

 paths, just as those of the lower limbs, pass into the cerebellum and 

 therefore will also be broken off by the process of the illness. 



I must acknowledge that I cannot very well give an explanation 

 of this fact, if not the possibility should be accepted of a better 

 connection of the equilibrium sensation of the arms (apart from the 

 cerebellum) with the cerebrum, than is the case with the legs. Later 

 experiments will have to give a decision on this point. 



CONCLUSION. 



L By interruption in the cerebellum of afferent cerebellar tracts, 

 originating from the vestibular organ and the tractus spino-cerebellares, 

 ataxia appears. 



2. According as these tracts suffer more or less, whether 

 alone, or together, the aspect of the cerebellar ataxia will present 

 a different type. 



42^ 



