426 THE CORNEA, BY ALEXANDER ROLLETT. 



cells of the form represented at c 1, fig. 389, longer ones are 

 intercalated of the form seen in o 2, fig. 389, and the clavate 

 form of cell may often be seen still more strongly expressed on 

 account of the attenuation of the inner part of the cell, as in 

 c 3, fig. 389. 



A highly refractile hem or border (fig. 389, c 1 2 3) exists at 

 the point where the cells rest upon the corneal tissue, which in 



Fig. 389. 



Fig. 389. External epithelium of the cornea of the Frog, a, Cells 

 from the outermost, 6, from the middle, andc, from the innermost layer. 



profile views recalls the smooth border that under some circum- 

 stances certain columnar epithelial cells exhibit at their free 

 margin. This border, which may be termed the basal border, 

 usually appears to be expanded, and this is always the case 

 with the clavate cells of the innermost layers. 



