PLATE LXX. 





FIR. 136. Vertical section of cornea of rabbit, hardened in chromic acid. a. Anterior layer of pavement 

 epithelium. b. Siibstuntui 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 Deacemet's membrane, and the endothelium of polyhedral cells, d, which covers 

 it. p. 138. 



FIG. 137. Diagram of the connective 

 substance of the retina. 



FIG. 158. Diagram of the nervous ele- 

 ments of the retina (after Max Schultze). 

 These two diagrams must be supposed to 

 fit into one another in such a way that 

 the nervous elements ail corresponding 

 spaces in the counecti-.-<j substance. In 

 157, the lower line represents the limitnni 

 inlerna ; the line 8 the limllant externa. 

 2. Layer of nerve fibres. 3. Layer of 

 ganglion cells. 4. Inner finely granular, 

 or, more correctly, ftnely fibrillated layer 

 which really 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 

 gramii-r layer, 5, proceed. The outer 

 processes of the elements of this layer 

 similarly terminate in a close finely 

 flbrillar 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, which ter- 

 minate as rods and cones, 9. p. 142. 



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