THE CENTRAL NERVOUS SYSTEM. 



309 



that in order to display Purkinje's cells to the best advantage the 

 tissue should be sectioned across, and not parallel with, the axis 

 of the convolutions. These cells, further, are not placed at uniform 

 distances throughout the row which they form, but are more numerous 



FIG. 340. 



Section of outer portion of cerebllar cortex of young dog, stained after Golgi's silver method: 

 P t cell of Purkinje, exhibiting profuse arborization of protoplasmic processes; p, its axis-cylinder 

 process; B, B, cells of outer layer whose axis-cylinder processes form basket- works around 

 bodies of Purkinje's cells ; C, small ganglion-cells limited to outer layer. (After Retzius.) 



and more closely arranged at the summit of the convolutions, 

 at the bottom of the fissures being more widely separated ; these 

 variations correspond with the areas of greatest and least development 

 of the nuclear layer. 



The molecular or outer layer consists of a ground-substance 

 of finely-reticulated supporting neuroglia, in which extend the elab- 

 orate arborizations of Purkinje's cells, together with certain 

 nervous elements belonging to this zone. These latter are of two- 

 kinds : small multipolar cells whose branched protoplasmic pro- 

 cesses extend towards the periphery, while the nervous process is 

 directed centrally, but probably is confined to the molecular layer, 

 and larger elements distinguished by the remarkable termination 

 of their axis-cylinder or nervous processes. While the protoplasmic 



