Chap, ix.] 



OF THE SENSE OF SIGHT. 



427 



Fig. 83. 



A; Elementa of the retma. — ^The trellis, isolated, of the supporting fibres : a, membrane, ex- 

 tremely fine, which separates the bacillated layer from the other layers ; e, verticalsupport- 

 ing fibres, with lateral prolongations and intercalated nuclei ((/) visible especially in the 

 median layers ; d, intermediary layer ; g^ molecular layer ; £, internal limiting membrane, 

 where the supportinp fibres have their origin. 



B, The nervoiu elements, isolated, of the retina : &, bacilla with external granules Q/) ; c. 

 cones with their granules (</) ; d, intermediary layer with fibrils extremely fine ; /, layer 

 with internal granules ; g, trellis of nervous fibres, very fine, in the molecnlar layer ; A; 

 ganglionary cells ; A', nervous fibres which proceed thereto ; i, fibres of the optic nerve. 



