EFFECTS OF RADIANT ENERGY ON THE EYE. 755 



necrosis of the stroma cells and endothelium of the cornea, to cause 

 hemorrhages in the iris, and to produce marked changes in the lens 

 capsular epithelium. 



March 20, there is abscess of the cornea. Marked photophthalmia 

 is noted with loss of epithelium. 



March 24, the abscess is larger. Enucleation is performed. 

 Lens capsular epithelium (flat preparation) on microscopic exami- 

 nation shows marked changes, and the iris shows numerous hemor- 

 rhages characteristic of exposure to ultraviolet light. 



Experiment 6. Dec. 16, 1913, a suspension of Staphylococcus 

 aureus in distilled water is injected into the cornea of a rabbit. The 

 injected area is then exposed twenty minutes to the magnetite arc 

 through a water-cell and a system of two quartz lenses. No screen 

 is used. 



As previously determined, with this arrangement an exposure of 

 thirty seconds is sufficient to cause marked keratitis and destruction 

 of the epithelium, while an exposure of twenty minutes causes com- 

 plete destruction of the corneal corpuscles and softening and swelling 

 of the stroma down to Descemet's membrane, and ultimately leads to 

 vascularization and cicatrization of the cornea. 



December 18, there is no abscess. Marked photophthalmia is noted. 

 The cornea is hazy and epithelium is absent from three quarters of the 

 surface of the cornea. 



December 26, there is no abscess. The inflammatory reaction is 

 almost gone. The cornea is softened and swollen. 



December 29, the inflammatory reaction is increasing again (reaction 

 of repair); the corneal tissue is very soft. Vascularization is well 

 advanced. 



Jan. 5, 1914, vascularization of the cornea is complete. The in- 

 flammatory reaction is subsiding. 



January 9, the vessels are beginning to disappear. The cornea is 

 leukomatous. 



Experiment 7. Dec. 19, 1913, the suspension is injected and the 

 exposure made as in Experiment 6, except that the time of exposure 

 is six minutes. This exposure is sufficient to cause softening of the 

 corneal stroma. 



December 21, marked photophthalmia is noted. There is an 

 abscess at the site of the injection. 



December 23, the abscess is smaller. A culture is taken. Enu- 

 cleation is performed. 



Culture shows abundant growth of staphylococci. Lens capsular 

 epithelium shows marked changes. 



