EFFECTS OF RADIANT ENERGY OX THE EYE. ()59 



Marked haze of cornea. Epithelium intact. Pupil widely dilated. 

 After 48 hours : Condition about the same. Microscopic examination 

 (48 hrs.) : Corneal stroma swollen to | normal thickness. Epithelium 

 intact. Corneal corpuscles completely invisible in central portion of 

 exposed area. At the periphery of the latter they show active pro- 

 liferation many of them being in mitosis. Endothelium absent 

 beneath exposed area. Iris and lens epithelium normal. Retina 

 normal — pigment epithelium unaffected. 



With flint glass screen {335 h/jl), hut without ivater cell. 



Experiment 91. Pigmented eye. Exposed 30 minutes. After 

 24-48 hours: No reaction, cornea clear. [Microscopic examination 

 (48 hrs.) : Cornea, lens epithelium, and retina normal. Pigment epi- 

 thelium of retina normal. 



SUNLIGHT. BLUE L"\"IOL SCREEN AND .001% SOLUTION OF AURAMIN O 

 IN QUARTZ CELL 5 CM. THICK. 



Light focussed on cornea by large quartz lens 12 cm. in diameter 

 and 25 cm. in focal length. Atmosphere not perfectly clear (April 2, 

 1913): 



Experiment 92. Albino. Exposed 45 minutes. After 24 hours: 

 ^'ery slight conjunctival reaction. Cornea hazy, epithelium intact. 

 Iris congested. After 48 hours: Condition about the same. Corneal 

 epithelium intact. Microscopic examination (48 hrs.): Corneal epi- 

 thelium intact. Stroma swollen to about f normal thickness. Cor- 

 puscles and endothelium completely destroyed in exposed area. At 

 periphery corpuscles show proliferative changes. Affected area wider 

 posteriorly than anteriorly. Xo characteristic abiotic changes made 

 out. Iris normal. Retina congeni tally defective (coloboma of optic 

 disc, ganglion cells few in number) shows no abiotic or heat effects. 

 Pigment epithelium normal. 



MAGNETITE ARC. QUARTZ SINGLE LENS. WATER CELL. CROWN GLASS 



SCREEN (295 fXfJ.). 



Experiment 93. Right e^^e exposed 8 minutes. Left e^e exposed 

 4 minutes. One hour later; Left eye exposed 4 minutes. After 

 twenty-four hours : Slight reaction in each eye without loss of epithe- 

 lium. After 3 days: No reaction. Magnetite arc. Double lens 

 system. Water cell. Crown screen (295 /x/x). Exposed left eye 



