OF THE NEKVUS OCTAVUS. 99 



Thus far we may hold it to be proved in a sufficient way, that 

 Marchi-inethod and inyelinisation-method are tending to similar 

 results. 



And GUDDEN'S method also rather confirms these results. A year 

 after rootsection in the young rabbit it may be demonstrated that 

 a large quantity of fibres has been lost in the dorsal radiation 

 between tuberculum acusticum and oval area and that the inter- 

 medial system , the dorsal transverse fibres and the descending root 

 are atrophied to an important degree (see Plate III fig. 13<z and 

 3a compared with 13/5 and 3/5). Still an important quantity of 

 fibres have been left in these tracts - - their secundary systems. 



Fibres are lost also in the nucleus of DEITERS, in the nucleus 

 of BECHTEKEW, in the nucleus griseus of the descending root, in 

 the lateral and ventral parts of the nucleus dorsalis N. VIII. And 

 from the medial trunk of rootfibres there is left nearly nothing. 



In such cases also cells have disappeared. 



As is demonstrated (Plate VII fig. 7 A H) before , there are 

 found in the portio interim the large cells in the nucleus of DEITERS, 

 the cells of small and midling size in the nucleus griseus, the 

 ventral apex of the dorsal nucleus and in the nucleus of BECHTEREW, 

 and the small cells along the fibres of the medial trunk between 

 area ovalis and spinal V nerve. In the dorsal nucleus (except in 

 the ventral apex and the nucleus of the sixth nerve) small cells 

 are found to prevail. 



Now I agree , with all the elder investigators , that no change 

 is seen in the large cells of DEITERS. As fig. \3a demonstrates 

 (if compared with fig. 133, Plate III) clearly, those cells have 

 suffered not the slightest alteration notwithstanding the important 

 atrophy of the fibres passing through the nucleus of DEITERS. 

 Consequently they may lay more closely together than those of the 

 other side , but, they do not alter , even not in a year after root- 

 section on a young animal. 



But this also is the case with the cells of midling and larger 

 size, which are found in the nucleus of BECHTEREW, in the ventral 

 apex of the dorsal nucleus, in the nucleus griseus radicis descen- 

 dentis and in the nucleus N. VI. 



Even a year after the operation, there may be found normal 

 cells in large quantity in these nuclei. Still cells have vanished, but 

 they are the small cells and among those of midling size, they are 

 also the smaller specimina. 



Those along the medial trunk of rootfibres are all gone. Many 

 cells also have disappeared at the latero-ventral border of the dorsal 



7* 



