THE EMBRYOLOGY OF THE EYE. 55 



small amount of protoplasm of a delicate 

 spindle form. 



The inner stratum of cells from which the 

 nerve-fibres run — the rudimentary ganglion- 

 cells (Fig. 14, A) — have a large nucleus at this 

 stage staining deeply with hematoxylin, and a 

 large cell-body with two distinct processes, one 

 continuous with a nerve-fibre, the other extend- 

 ing back among the retinal cells. 



The stratum of ganglion-cells is separated 

 from the mass of the retinal cells by a stratum 

 of rather large cells (Fig. 14, B), the nuclei of 

 which stain very faintly, and which a little 

 later disappear almost entirely to give place 

 to a delicate network striated longitudinally — 

 the inner reticular layer (Fig. 15, B). From 

 this time on we notice long nucleated fibres 

 staining deeply in the outer cellular layers 

 (Figs. 14 and 15). 



The outer reticular layer is formed later, 

 exactly as the inner layer was formed. That 

 is, there is a stratum of cells near the inner 

 reticular layer which stain deeply, and just 



