184 THE EYE. 



Substantia propria of the Cornea, consisting of connective 

 tissue fibres in more or less parallel bundles, between which 

 are the Cornea corpuscles ; these, in vertical sections, 

 appear spindle-shaped, c, The posterior Lamina elastica, or 

 Descemet's membrane, d, The Endothelium of polyhedral 

 cells which covers it. 

 Fig. 5. — Diagram of the nervous elements of the Ketina (after Max 

 Schultze) : — 

 1, The Limitans interna. 8, The Limitans externa. 2, Layer 

 of nerve fibres. 3, Layer of ganglion cells, 4, Inner finely 

 granular, or, more correctly, finely fibrillated layer, which 

 forms an extremely close network of very fine fibres, into 

 which, on the one hand, the processes of the ganglion cells 

 penetrate ; out of which, on the other hand, the fibres of the 

 inner granular layer, 5, proceed. The outer processes of the 

 elements of this layer similarly terminate in a close, finely 

 fibrillar network ; 6, the intermediate granular layer, or outer 

 finely granular, or, more correctly, finely fibrillar layer. Out 

 of this proceed the inner processes of the outer granular 

 layer, 7, whch terminate as rods and cones, 9. 



,, 6. — The jDosterior half of the Retina of the right eye, viewed 

 from before (after Henle) : — s. , the cut edge of the Sclerotic 

 Coat ; ch. , the Choroid ; r. , the Retina ; in the interior at 

 the middle, the Macula hitea, with the depression of the 

 Fovea centralis, is represented by a slight oval shade ; towards 

 the right side, the light spot indicates the colUculus, or emi- 

 nence, at the entrance of the optic nerve, from the centre of 

 which the Arteria ceritrall'^ is seen spreading its branches into 

 the Retina, leaving the part occupied by the macula com- 

 paratively free. 



,, 7. — A diagrammatic section of the Macula Lutea, or yellow spot : 

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

 granular layer ; /, inner granular layer ; g, molecular layer ; 

 h, layer of ganglionic cells ; i, fibres of the optic nerve, 

 mag. about GO diameters. 



,, 8. — Arrangement of fibres of Lens in the Mammalia. 



,, 9. — Fibres of the Lens in Eye of Cod-Fish. 



,, 10. — Diagram representing, by dotted lines, the alteration in the 

 shape of the Lens, on acconnnodation for near objects. 



