( 285 ) 



i'cliciilaris ot' llie crossed side and ascciidiiio- fVon lal wards are found 

 in the same reg'ion np 1o llieir juiiclioii willi the superior crus 

 cere bel 11. 



My own seclions sn_ü,<2,es( very sh-ouüly indeed, lha( Ihese centri- 

 fugal (from the cerebellum, or i-ather from the luicleus dentatus) 

 fdn-es, take their course by the supertlcial layers of the middle cere- 

 bellar peduncle and then can be followed right through the pyrami- 

 dal bundles or partly winding ai'oujid them (o the reticular substance. 



In (bfrereiit sei'ies it becomes clear that |)roceeding in the series of 

 sections from below upwards there, where ai-e found the first dege- 

 nerate fibres in the reticular substance, also the first degenerate fibres 

 appear in the middle peduncle. While by Thomas no sound reasons 

 are given for his conception about the significance of this bundle, 

 it pleads agaijist the opinion of Probst that in the region of the 

 vestibulary nuclei, ]io degenerate fibres are found. 



Finely the sections show, compared with the sections gained l\y 

 other ex])erinieuts, that the ventral thalamic bundle originates for 

 the greater part from the ventral portions of the cerebellum, especi- 

 ally of the flocculus. Sections of cats-brain after similar operations 

 leave no doubt, that after lesion of more dorsal cerebellar jjortions, 

 there exists a very marked contrast between the very pronounced 

 degeneration of the crus cerebelli ad corpora cpiadrigemina and the 

 very slight degeneration of the vejitral thalamic bundle, whereas as 

 well in the cat as in the rabbit after exclusive lesion of the flocculus, 

 both bundles are affected about equally. 



Physics. — "TJic rn/itl/f// of flu' him of (uvirsjjondüif/ states for 

 mldurcs of metlnj} ch}o]'i(h' and carbon dnwlde," by Prof. H. 

 Kamkrlingh Onnks and Di-. V. Zakrzkwski. ('omnmnication 

 N\ 92 from the Physical Laboratory at Leiden by Prof. Dr. 

 H. K VMERTJNou Onnks (contiiiued). 



(Comnuinico.tcd in tlic nioctinsi' of June 25, lUOi). 



§ 1. Introduction. In n". IX of the "Contributions to the knowledge 

 of VAN DER Waals' ifvsurface" we have expressed the hope of giving 

 an experimental conti'il)ution to the investigation of the co-existing 

 mixtures of methyl chloride and carl)on dioxide at low temperatures 

 in connection with the fesf of the law of coi*res})0]iding states for 

 mixtures, which for many yeai-s has formed a subject of experimen- 

 tation at Leiden. Of the extensi\e territory of reduced states, which 



