( 2<sa ) 



(M(uall_v oil (lie opcM-aled si(l(\ In Ihc superior cervical rcuioii also a 

 small lieUl willi llie base lyiiiü lowards the inarf>iii. tlie point 

 towards tli(> ri^stitorin body was lonnd fnll of de,i>onorate lihrcs. 

 TiOwer d(n\ii lliaii llu^ nppci- c(M'vical scunuMiIs, tlicso dei>enorato 

 tilircs do not i'cacli. In this case not only the lloccniiis and the 

 lloccnlar peduncle, but also the vestibnlary iinclens was severed, 

 so that also this experiment cannot be recounizcMl as a clear 

 experiment. 



Althoiiu'h allowance must be made for an e\entnal different i-osult 

 after e.\tiri)ation of other parts of the cerebellum of the rabbit, so 

 we think, thai these experiments show clearly the abs(Mice of 

 descend in<j,- dej;eneration after a shar])ly localised lesion of the floc- 

 C'ular cortex. The discussion in the literature between Mar( iir, Fkr- 

 RiKR and TrRNF.R. Thomas, Uikdi, and IvIsif.n RrssKi-L regai-ds the 

 question, how much of the fonnd degenerations must be ascribed to 

 lesion of the neighbourhood, because, as Thomas justly remarks, exactly 

 in this region of the cerebro-spinal axis it is characteristic, that also 

 without direct lesion by the severing instrument yet by haemorrhage 

 or an alteration of pressure, extensixe degenerations can be caused. 

 x\s in these expei-iments certainly no such lesion of the neighbourhood 

 can have arrived and in the completely successful cases the cord 

 was found free of degeneration, we may be sure, that from the 

 ganglioncells of this part axis-cA linders with centrifugal course to the 

 medulla are not found, so that for this [lart of the cerebellum at least, 

 the original data of Marchi are not confirmed. Thus these observations 

 as also those of Probst can be regarded to agree witli the Kngiish 

 observers, after whom only after lesion of the nncIeus-DEiTKRs des- 

 cending degeneration of the anterior and lateral tracts is found. In 

 judging this result it is important to observe, that also in another 

 point than by its own bony capsule the rabbit must be regarded as 

 an abnormal form. 



The flocculus of the rabbit contains viz. except its part of the 

 cerebellar cortical gray matter and its af- and ef-ferent fibres also a 

 nucleus of large multi|)olar ganglioncells, such as are found in the 

 nucleus dentatus. The study of ihe development of kindred animals 

 (s(piirrel) leave not the leas! doubl, thai IikKmmI a part of the dentate 

 nucleus is dislocated in Ihe llocculus. It ap|)ears that it is not 

 always in connection with the principal nucleus. 



Now 1 do nol ihiidv thai for the elucidation of Ihe (piestion. Axlu^lher 

 there exist descending cerebellar tracts, this circuinslance must be 

 regarded an indesirable complication, but rather we may i-eckon this 

 a useful detail, in so far as it allows to exclude at the same lime, 



