158 C. WINKLER. THE CENTRAL COURSE 



in frogs, the specific disturbances of the equilibrium found after 

 removal of the labyrinth , are not at all influenced by the removal 

 of the prosencephalon. 



The later minute experiments of EWALD upon dogs, teaching that 

 the motor disturbances following the removal of the labyrinth , are 

 compensated and corrected to a certain degree by the motor area 

 of the cortex cerebri , are not in the least in contradiction with 

 the here expressed opinion *). 



All these authors are disposed to defend the view that the 

 influence exerted upon motility by the N. octavus is merely an 

 automatic function , playing beneath the cortex cerebri , without any 

 direct participation of the cortex to its genesis and my anatomical 

 researches also support this opinion. 



Nevertheless it may be argued , that the octavo-motor inner vations 

 like all other sensu-motor innervations, though localisated in subcor- 

 tical centres, may come to a vague perception. 



I do not deny a priori the possibility of the perception of 

 innervations. There may be alleged many facts in favour of the 

 ,,Innervations-Gefuhle" as they were called in german litterature, 

 or of the ,,somato-psychic perceptions" as WERNICKE has called 

 these perceptions in his eminent treatise on psycho-physics. 



But even in that case no direct comparison is allowed between 

 those complicated and little-known sensations, with the true sensory 

 perceptions (the ,,allopsychic" perceptions of WERNICKE) as hearing, 

 seeing , etc. are. 



YVES DELAGE has demonstrated in a most proving way , that 

 our orientation into space , depends not upon the altering periferical 

 irritations in the labyrinth , but upon the altering tonicity in the 

 muscles of the eyes and of the L trunk. 



These muscles are under permanent regulating control of optic 

 and kinaesthetic impulses, as well as under the control of laby- 

 rinthic impulses. 



But here we also meet with automatic control of equilibration. 



In my country, at fairs or. other popular amusements, there is often 

 found a room with moveable walls, which may be turned round. 



Benches are placed upon the unmoveable floor, wherein people 

 take place. As soon as the turning of the walls begins, as the 



*) These experiments may perhaps be a clue to the understanding of an inconstant 

 result found sometimes, long after the removal of one labyrinth in young born rabbits. 

 I stated once a total atrophy within the crossed motor area of the cortex, with 

 a rather intense atrophy of the anterior pyramis-tract of that side, nearly a year after 

 the operation. Less intensive atrophy of it was also seen. 



