1198 



STRUCTURE OF THE RETINA. [BOOK m. 



FIG. 145. DIAGRAM TO ILLUSTRATE THE STRUCTURE OF THE EETINA. 



The figure is quite diagrammatic and is introduced simply to assist in the 

 description of the probable structure of the retina. 



The several " layers " are indicated by the numeral I, &c. in order from within 

 (vitreous humour) outwards. 



On the right-hand side is shewn a fibre of Miiller reaching from the inner limiting 

 membrane m.l.i., formed by the coalescence of its feet, to the outer limiting 

 membrane m.l.e.; the lateral processes of the fibre are indicated, as well as 

 the neuroglial fibrils (possibly independent of the fibres of Miiller), in III. the 



