342 



LECTURE XIV. 



that might have been looked for, for then we should 

 rather have expected that the hindermost layer would be 

 the first to undergo the change. If any influence from 

 without had been here in operation, the opacity must 

 have been seated in the most anterior layers ; if again 

 the opacity were one which essentially proceeded from the 

 vessels, we might, inasmuch as they chiefly lie along the 

 border and nearer to the anterior surface, have expected 

 to find the principal disease there. Finally, if the 

 changes had their origin in the nerves, we should have 

 found the opacity spread in the form of a network on 

 the surface and not a bow of this kind. 



The substance of the cornea consists, you know, ac- 

 cording to general opinion, of lamellae (plates) which 

 run in a more or less parallel direction through the 



FIG. 100. 



cornea. Now if this opinion be the correct one, we 

 should have to deal with a process which, whilst advanc- 



Fig. 100. Perpendicular section of the cornea of the ox, for the purpose of showing 

 the form and anastomoses of its cells (corpuscles). Here and there are seen the 

 cut ends of some of the processes of the cells, looking like fibres or points. 500 

 diameters. From His, ' Wiirzb. VerhandL,' IV., plate IV., fig. I. 



