20 Journal of Comparative Neurology. 



ous axis-cylinders which partly belong to the granule cells (very delicate), partly 

 to the Purkinje cells and are partly derived from cells lying outside the cere- 

 bellum. 



Fig. 12. Axis-cylinders of small granule cells proceeding horizontally and 

 their terminal arborizations in the molecular layer. Two 'X'-shaped divisions 

 of the ascending main fibers. 



Figs. JJ-14. Large granule cells. 



PLATE in. 



Fig. /J. Large granule cell. 



Fig. 16. Ascending nerve fiber of extraneous origin and its terminal arbor- 

 ization in the molecular layer. 



Ftg. ij. Irregular arrangement of the nerve fibers (neurites of the Pur- 

 kinje cells and " ascending fibers ") in the granular layer. 



Fig. 18. Arrangement of the nerve fibers transversing the granular layer 

 in distinct bundles which go over into a basal fiber-layer. 



Fig. ig. Ependyma cells from the neighborhood of the median furrow of 

 the cerebellar plate. 



PLATE IV. 



Fig. 20, Modified ependyma fiber traversing the whole thickness of the 

 cerebellar plate. 



Fig. 21. Modified ependyma fibers in the granular layer. 



Fig, 22. Modified ependyma fiber from a region of the cerebellar plate 

 where the granular layer is missing. The slender terminal arborizations of the 

 fiber penetrate between the Purkinje cells. 



Fig. 2 J. Neuroglia cells of the molecular layer (Bergmann's fibers). 



