THE COENEA 



567 



it is slightly fibrillar at its extreme margin where it becomes con- 

 tinuous with the fibrous tissue of the sclera. It resembles elastic 

 tissue in that it is highly refractive and possesses a shining glassy 

 appearance. It does not stain readily with the ordinary dyes. 



The corneal substance (sulstantia propria) forms the greater 

 portion of the cornea. It consists of a lamellated connective tissue, 

 which forms about sixty fibrous layers, parallel to the corneal snr- 



FIG. 419. CORNEAL CORPUSCLES OF THE FROG. 



a, as seen in tangential section ; 6, as seen in transection of the cornea. Chlorid of gold. 

 Highly magnified. (After Rollett. ) 



