STRUCTURE OF LENS. 



563 



time is cut off from the parent tissue. The stages of its develop- 

 ment may be followed in the wood-cuts (Fig. 218) shown on 

 page 561. 



FIG. 220. 



Fragment of lens teased out to show the separate fibres. (Cadiat.) o, 6 and c show 

 fibres with different sized nuclei. 



The lens is composed of a number of peculiar band-like cells, 

 derived from the epithelium. These are cemented together in 

 parallel rows, eccentrically arranged in layers. These bands are 



