Monthly Microscopicall 
Journal, Nov. 1, 1869. J 
Histology of the Eye. 
231 
been arrived at respecting its nature. The passage of the perfo- 
rating nerve-fibres quite through the epitheHum, and their free 
termination at the outer surface of this, described by one observer 
Fig. 3. 
Corneal Nerves perforating the Anterior Elastic Lamina. 
(Cohnheim). requires, I think, confirmation. I have not myself 
succeeded in tracing these fibres beyond the middle tier of epithelial 
cells; nor have I yet been able to demonstrate their ultimate 
distribution. 
The only remaining corneal tissue is the delicate memhrane 
which lines the posterior surface of the lamellated tissue, called 
after Demours and Decemet, and sometimes also named the posterior 
elastic lamina. Its thickness is only about one-third of that of 
the anterior elastic lamina. It is perfectly homogeneous, without 
the slightest trace of structure. It is separable from the lamellated 
tissue by careful dissection in pieces of large size. 
A single layer of delicate pavement-epithelium lines the inner 
surface of the lamina. Its cells poliferate in some forms of 
keratitis, and produce minute opaque dots upon the back of the 
cornea, recognizable when illuminated by an oblique pencil of 
hght. 
