658 VERHOEFF AND BELL. 



action. Cornea clear. Microscopic examination (48 hrs.): Cornea, 

 lens epithelium, and retina normal. 



Jl'ith 1.5% copper chloride solution substituted for water in quartz cell, 

 crown glass screen {295 fifx) and blue uviol screen, the whole obstructing 

 all leaves less than 320 /xju and longer than 700 ^t/x in length. 



Experiment 86. Exposed 1 hour. No effect. Microscopic exam- 

 ination (48 hrs.): Cornea, lens epithelium and retina normal. 



With 1.5% copper chloride solution and blue uviol screen, obstructing 

 all waves less than 320 fifi and longer than 700 ju/z in length: 



Experiment 87. Exposed 1 hour. No effect. IVIicroscopic exami- 

 nation (3 days): Cornea, lens epithelium, and retina, normal. 



With flint glass screen {315 iin). {The tvater cell leaked so that for 

 an unknown length of time the eye received also infra red rays) : 



Experiment 88. (PI. 1, Fig. 3). Albino. Exposed 1 hour. 

 After 24 hours: No conjunctivitis. IVIarked haze of cornea, epithe- 

 lium intact. After 48 hours: Haze persists. Epithelium intact. 

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

 Stroma swollen to double normal thickness, stains faintly in eosin. 

 Corpuscles and endothelium completely destro\ed in exposed area. 

 At periphery of affected area corpuscles show active proliferation with 

 mitoses (page 693). Iris shows a few minute hemorrhages near 

 pupil. Lens epithelium normal. Retina: Pigment epithelium shows 

 distinct heat effect over an area 6 mm. in diameter. The cells are 

 swollen or stain deeply in eosin, and their nuclei are often pycknotic. 

 Otherwise the retina is normal. 



With crown glass screen {295 fxfx): 



Experiment 89. Aphakic eye. Pigmented. Exposed 35 minutes 

 with intermissions of 1 minute every five minutes. Light focussed 

 on opening in lens capsule. After 24-48 hours: Marked keratitis 

 with loss of epithelium. Microscopic examination (48 hrs.): Cornea 

 shows typical abiotic changes. Epithelium and endothelium absent. 

 Iris (only slightly exposed) shows a few minute hemorrhages. Pig- 

 ment epithelium of retina shows marked heat effect over an area 4 mm. 

 in diameter. Ganglion cells and other retinal elements normal. 



JVith flint glass screen {315 fxii) but without tvater cell: 



Experiment 90. Pigmented eye. Atropine mydriasis. Exposed 

 30 minutes. Immediately after exposure: Cornea clear. Pupil con- 

 tracted. After 20 minutes: Distinct haze of cornea. No conjuncti- 

 vitis. After 4 hours: Haze of cornea marked. Epithelium intact, 

 does not stain. No conjunctivitis. Pupil larger, vertically oval. 

 Prompt lid reflex to light. After 24 hours: No conjunctivitis. 



