PLATE 3. 





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Fig. 7. 



Exp. 70. 



Fis. S. 



Magnetite arc. DouVjle lens system, no screen, 



Figure 7. 

 exposure 20 minutes. 



Lens capsular epithelium 2 months after exi:)osure, showing rejiarative 

 changes. The nuclei vary greatly in size and many of them are extremely 

 large. iSome of the cells contain double nuclei. The small dots in the cells 

 are nuclear buds constricted off from the main nuclei. They are not related 

 in any way to the granules in Figs. 3 and 4. Photo. X 264. 



Figure 8. Magnetite arc. Double lens system. Crown glass screen (295 

 nn), exposure 20 minutes. 



Lens capsular epithelium 19 hours after exposure, showing wall of deeply 

 staining cells, corresponding in position to the pupillary margin. Photo. 

 X 42. 



Fig. 9. 



Figure 9. Exp. 54. 



Fig. 10. 



Single lens system, crown glass 



Magnetite arc. 

 screen (295 mm), exposure 20 minutes. 



Lens capsular epithelium 48 hours after exposure, showing vail. Many of 

 the cells in the unexposed zone outside the wall are in mitosis. Photo. X 42. 



Figure 10. Lens capsular epithelium 48 hours after injection of Lugol's 

 solution in the anterior chamber, showing wall similar to that produced by 

 abiotic radiations. (See page 676), Photo. X 106. 



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