OF DENISON UNIVERSITY. 



6S 



opinion, undoubtedly to be regarded as centrifugal. All medullated 

 fibres springing from cells are centrifugal. Branching jjrotoplasmic 

 processes of cells are perhaps centripetal, while the so called nervous 

 processes of these, even where non-meduHated, may be centrifugal." 



(I.) The granular layer contains, besides scattered ganglion cells, 

 innumerable multipolar nerve cells, both larger and smaller. 



(2.) The very numerous small granular cells have only short 

 protoplasmic processes terminating at the end in a brush. The ver)' 

 delicate nervous process usually springs from one of the protOj)lasmic 

 processes and passes vertically into the molecular layer, where it di- 

 vides into two unbranched fine fibres running horizontally and longi- 

 tudinally. 



(3.) The large granular cells are less numerous and their densely 

 branched fibres may penetrate deep into the white zone. The nervous 

 process is abundantly branched in a small area and seems not to pass 

 beyond the granular layer. 



(4.) Purkinje's cells do not anastamose. The nervous j)rocess 

 has a few fine branches ascending to the molecular layer. 



(5.) The small cells of the molecular layer are separable into 

 outer smaller cells and the inner or basket cells, The former are pro- 

 vided with strongly branched protoplasmic processes and a nervous 

 process, the course of which is not yet known. 



The basket cells have long, strongly branched protoplasmic pro- 

 cesses, which may extend to the outer edge of the molecular layer. 

 The nerve process is very long and passes transversely over the bodies 

 of the Purkinje's cells and here and there sends downward perpendic- 

 ular processes which subdivide and envelop the body of the Purkinje's 

 cells in a basket-like reticulum. 



(6.) The medullated fibres in the adult cerebellum do not divide, 

 except rarely in the molecular layer. 



(7) The results of Golgi's method reveal no actual anastamosis 

 of cells and does not suggest any ground for assuming the existence 

 of a nervous reticulum. 



Our own work has been too superficial to justify extended criti- 

 cism of the results quoted, but we venture a few suggestions 



ist. Successful hc-ematoxylin staining brings out the nervous ele- 

 ments with certainty and reasonable clearness. Golgi's method is 

 liable to introduce error, in that the staining involves connective tissue 

 elements and is variable. 



