EFFECTS OF RADIANT ENERGY ON THE EYE. 657 



distinct. After 1 hour: Haze more distinct. Epithelium intact. 

 After 2 hours. Epithehum intact. Shght diffuse deep staining of 

 stroma with fluorescine. Animal avoids obstacles by sight (other 

 eye absent). After 24 hours: Cornea hazy, shows loss of epithelium 

 (3 mm.). After 48 hours: Epithelium reformed. Microscopic ex- 

 amination (48 hrs.); Corneal epithelium intact but thin. Stroma 

 swollen to almost twice normal thickness. Corpuscles completely 

 destroyed in posterior portion of exposed area, a few present in anterior 

 portion show no abiotic changes. At periphery of exposed area the 

 cells are actively proliferating. Endothelium absent. (Iris not ex- 

 posed). Lens epithelium normal. Retina normal. 



Experiment 83. Pigmented eye. Light focussed on anterior 

 pole of lens instead of on cornea as in previous experiment. Pupil 

 not fully dilated. Total exposure 1| hours. Exposed 30 minutes. 

 During the exposure, the pupil became contracted. Immediately 

 after exposure: Cornea clear. After 50 minutes: Cornea shows dis- 

 tinct haze. After 1 hour: Exposed 1 hour. Immediately after 

 exposure: Iris congested, pupil contracted (about 1^ mm.) and irregu- 

 lar, does not dilate in the dark. Cornea more hazy. After 2 hours. 

 Corneal haze very marked. Epithelium intact, does not stain. Pupil 

 slightly larger. After 24 hours: No conjunctival reaction. Pupil 

 dilated, but not fully so. Cornea shows marked haze without loss 

 of epithelium. After 48 hours : Conditions about the same. Epithe- 

 lium intact, does not stain. Microscopic examination: (48 hrs.): 

 Corneal epithelium intact. Stroma swollen to f normal thickness, 

 and corpuscles aft'ected as in previous experiment. Endothelium 

 absent. Iris normal. Retina normal. Lens epithelium shows slight 

 but definite abiotic changes. Cells are slightly swollen in exposed 

 area and a few of them contain characteristic granules. 



]]'itli flint glass screen (310 fxfx) : 



Experiment 84. Exposed 1| hours. After 24 hours: Marked 

 central haze of cornea. Epithelium intact, does not stain. After 

 2 days: Haze of cornea about the same. Epithelium intact, does not 

 stain. x\fter 4 days: Cornea clearer. Epithelium intact. Micro- 

 scopic examination (4 days): Epithelium intact. Corneal stroma 

 swollen to about f normal thickness. Corneal corpuscles nowhere 

 destroyed, show marked proliferative changes, especially in posterior 

 portion of cornea. No abiotic changes seen. Endothelium absent 

 in places. Lens epithelium normal. Retina normal. 



With flint glass screen (315 fxn) : 



Experiment 85. Exposed if hours. After 24-48 hours: No re- 



