654 VERHOEFF AND BELL. 



Experiment 55. (PI. 2, Fig. 5). Albino. Crown glass screen 

 (295 iJLn). Exposed 1 hour. Marked reaction with loss of epithelium. 

 Microscopic examination (24 hrs.): Corneal corpuscles destroyed in 

 central area, endothelium absent, marked abiotic changes in lens 

 epithelium. Iris shows interstitial hemorrhages and slight purulent 

 exudation from vessels. Retina shows burned area. 



Experiment 56. Pigmented eye. No screen. Exposed 20 minutes. 

 Marked reaction with loss (|) of corneal epithelium. Beginning 

 vascularization of cornea on 6th day. Microscopic examination (6 

 days): Corneal epithelium reformed, corpuscles largely destroyed, 

 endothelium absent. Lens epithelium shows marked changes. 

 Iris: Most of the stroma cells destroyed in anterior half of iris for a 

 distance of 1.5 mm. from the pupillary margin. Some of the stroma 

 cells show characteristic granules. A few mitotic figures seen. Endo- 

 thelium entirely absent from some of the blood vessels. Interstitial 

 hemorrhages. 



Experiment 57. x\lbino. Crown glass screen (300 ^^u). Exposed 

 15 minutes. Little if any reaction. Microscopic examination (6 

 days): Cornea, iris, and lens epithelium unaffected. Retina shows 

 heat effect involving pigment epithelium only. 



Experiment 58. Pigmented eye. Flint glass screen (315 /x/i). Ex- 

 posed 1 hour. No reaction. Microscopic examination (6 days) : Cor- 

 nea, iris, and lens epithelium unaffected. Retina shows burned spot. 



Experiment 59. Albino. Flint screen (335 ^/x). Exposed 1^ 

 hours with 5 minutes intermission at end of 30 minutes. No reaction. 

 Microscopic examination (2 days) : Cornea, iris, and lens epithelium 

 unaffected. Retina and chorioid show burned area. 



MAGNETITE ARC. QUARTZ DOUBLE LENS SYSTEM. WATER CELL. NO 



SCREEN. 



Experiment 60. Exposed 5 seconds. No effect. 



Experiment 61. Exposed 10 seconds. Slight reaction. Corneal 

 epithelium lost in exposed area. 



Experiment 62. Exposed 10 seconds. Result same as in Experi- 

 ment 61. 



Experiment 63. Exposed 30 seconds. Marked reaction. Slight 

 haze of cornea with loss of epithelium. 



Experiment 64. Exposed 5 minutes. Marked reaction. Soften- 

 ing of corneal stroma. Translucent corneal scar at end of two months. 



