1912.] The Effects of Ultra- Violet Rays upon the Eye. 323 



Fig. 2.— Twelve months old. 

 Anterior lens capsules of normal rabbits. (Dividing nuclei indicated by dots.) 



Histological Changes in Lens and Ciliary Body resulting from Exposure to 

 Rays of Short Wave-length. 



As a source of light containing the highest possible proportion of short 

 wave-length rays, the Kromayer water-cooled mercury-vapour lamp was 

 employed. This consists of a mercury arc in a quartz vacuum-tube 

 surrounded by a water-jacket with a quartz window. 



