IX 



THE RETINA 



42S 





a ^' "^ <<^ o* '^" 



Fio. 138.— A Di AORAMMATio SBOTroif or THE Macula Lctea, or 



Yellow Spot. 

 a a the pigment of the choroid ; b.c, rods and cones ; d.d, outer 

 granular or nuclear layer ; f.f, inner gi-anular or nuclear layer ; y.cj, mole- 

 cvdar layer ; h.h, layer of nerve cells ; i.i, fibres of the optic nerve. 

 (Magnified about 60 diameters.) 



In addition to the bipolar cells {r.h.p. and c.h.p.) which 

 chiefly confer upon the inner nuclear layer {IV) the 



