76 



The iegrae of br-inching exhibits v»iis diversity. Certain 

 fibres (Pig. 18, a) have some half-dozen principal branches of 

 various lengths, none of them very long nor diverging widely 

 from the main stem; besiles the principal branches, there are 

 shorter twigs distribated sparingly along both the main stem 

 and its ramifications. Other fibres (Pig. 18, c) are so beset 

 with a multitude of small twigs, quite irregular in their branch- 

 ing, that the whole series is given much the appearance of a 

 long and cylindrical brash. Betwsen these two extremes, there 

 are every intermediate condition of branching forms. 



The ependymal fibres lie quite near to each other, and the 

 many processes from them constitute an interlacing tangle, the 

 profusion and extreme delicacy of which cannot be adequately 

 represented in any drawing. In order to appreciate the sig- 

 nificance of this dense supporting framework, the vast number 

 of the granular neurones must be recalled. Here we fini the 

 means by which these nervous elements are given that support 

 which is one of the primary conditions for their activity. 



b. h'aupoglia. — The neuroglia provides a support for the 

 outer structures of a cerebellar fold, just as the ependyma 

 functions within. The characteristics of neuro^liar elements 

 are shown in F'ig.l9,ast and bg.f. The cell-body lies at the 

 juncture of the molecular and granular layers, between the 

 cells of Purkinje. Two conditions are to be distinguished. 

 One variety (Pig. 19,ast) has a cell-body of quite irregular 



