150 C. W1NKLEE. THE CENTEAL COUKSE. 



black globules, spread everywhere in the medulla oblongata, in 

 all sections made through it. I believe that many of those black 

 globules correspond with degenerate root-fibres situated in the dor- 

 sal part of the formatio reticularis and reaching in their course the 

 fasc. long. post. 



But I also believe, that a large part of them do not cor- 

 respond to such fibres, but are transferred products of my elm- 

 degeneration. 



Therefore I only accept the slight but evident degeneration in 

 both fasciculi longitudinales posteriores and I do not draw any con- 

 clusion as to the manner in which the fibres of the formatio reti- 

 cularis enter into both. 



I am unable to decide whether any degenerate root-fibres may 

 reach the lateral part of the tegmentum, and as I have made no 

 injuries in the central systems of pigeons I cannot give an opinion 

 concerning this question. 



b. The descending rootfibres. More interesting however are the 

 degenerate fibres, descending in the fasciculus longitudinalis posticus 

 and in the fasciculus praedorsalis. 



They are found on both sides and, as has been described be- 

 fore, at the entrance of the roots, they are more numerous in the 

 contralateral bundle. Followed in distal direction their number, howe- 

 ver, rapidly diminishes. Therefore the number of degenerate fibres in 

 the homolateral bundle soon prevails above that in the contra-lateral. 

 This is the case at the proximal end of the nucleus of the X lh . 



At the distal end of the medulla oblongata, as a distinct diffe- 

 rentiation between the fasciculus longitudinalis and fasciculus prae- 

 dorsalis no longer exists and as together they are forming the area 

 along the raphe, ventrally from the nucleus of the XII th nerve, 

 this area contains a notable number of degenerate fibres at the 

 operated side. In the contralateral area there are only a few. 



Through this area the descending rootfibres may be continued 

 in the funiculus anterior of the spinal cord. There they are situ- 

 ated along the fissura anterior and along the commissura anterior, 

 at the operated side. They gradually enter in the antero-lateral 

 part of the grey horn. Without doubt they provide in this manner 

 the homolateral cervical horn and the grey matter in the cervical 

 intumescentia. As to tracing them farther in the thoracical medulla, 

 I dare not confirm their reaching it. 



Moreover I am not sure that in the other funiculi of the cervical 

 cord the presence of degenerate fibres, after removal of the labyrinth 

 may be denied. 



