20 



THE EYE. 



apt to develop, in adult age, low papilliform projections on the inner surface of the 

 membrane ; with old age these become more marked and the whole membrane 

 becomes thicker, and may measure as much as 0*02 mm. It is lined next the anterior 



Fig. 20. A. CORPUSCLES OP THE CORNEA. FROM A PREPARATION TREATED WITH CHLORIDE OF GOLD. 



(Waldeyer.) 



B. CELL-SPACES OF THE CORNEA. FROM A PREPARATION STAINED WITH NITRATE OF SILVER 



(Waldeyer.; 



Fig. 21. CELLS OF ENDOTHE- 



LIUM OF BIRD'S CORNEA. 



(After Smirnow and Nue'l. ) 



chamber with an en- 

 dothelium (fig. 10, 5), 

 which resembles that on 

 serous membranes, con- 

 sisting of a single layer 

 of flattened polygonal 

 cells with distinct nuclei. 

 These cells are fibrillar 

 in structure, being tra- 

 versed by bundles of fine 

 fibrils which pass from 

 cell to cell across the 

 intercellular spaces (fig. 

 21), and are probably formed by threads of protoplasm, for they undergo rapid 

 alteration, and very soon disappear after death or removal of the globe. (Nuel, 

 Smirnow.) 



Near its circumference the membrane breaks up into bundles of fibres, which 

 give attachment to the ciliary muscle (see fig. 22), but a few fine fibres are continued 

 into the substance of the iris, around the angle of the anterior chamber. To these 

 radiating and anastomosing bundles of elastic fibres prolonged from the circum- 



