THE CEREBELLUM 



241 





FIG. 157. VERTICAL SECTION, CORTEX OF CEREBELLUM. PORTION OF SECTION 

 SHOWN IN FIG. 156, MOKE HIGHLY MAGNIFIED (X 250). 



A. Outer layer of gray matter. 



B. Layer of Purkinje's cells. 



C. Inner gray layer. 



D. White nerve-substance. 



tissue as to divide the outer gray matter into two prominent layers. 

 The explanation of this will follow increased amplification.) 



3. The central white matter. (The fibrillar character can be 

 made out, and the general plan will be found to consist, as in the 

 cerebrum, of central nerve -fibers radiating toward the cells of 

 the cortical gray substance, the arbor vitae.) 



(H.) 



4. The outer gray layer, or molecular layer. (This is the 

 thickest of the three layers. The prominent elements to be ob- 

 served are : the scattering neuroglia- and ganglion-cells, nerve- 

 fibrils, and blood-vessels, which pass in from the pial invest- 

 ment.) The ganglion -cells of the molecular layer are of two 

 sorts, small and large. The large cells are remarkable for their 

 axis -cylinder processes, which at intervals give off branches whose 





