THE CEREBELLUM OF AMBLYSTOMA 



265 



layer and granular layer, respectively. There are important dif- 

 ferences of detail, as compared with the corresponding layers of 

 the higher vertebrates, which will be set forth in the description 

 of the different zones. 



,COTT1.cb. 



tt Km 



nucmesJL ' 



,com.cbl 



Fig. 5 Sagittal section through cerebellum of Amblystoma tigrinum near 

 median plane. Series CLXXXVI, si. 5. Cajal method. X 125. 



Fig. 6 Sagittal section through cerebellum of Amblystoma tigrinum. Most 

 medial section but one. Series CLXXXVI. Cajal method. X 125. 



The outermost or molecular layer (figs. 4, 5, 6, 7, str.mol), which 

 Stieda described as being composed of a granular ground substance 

 with but few nuclei, consists chiefly of fibers with but few cells. 

 The larger fibers are myelinated, but Cajal sections reveal a 



