652 VERHOEFF AND BELL. 



Full grown rabbits were used in all the experiments and the light 

 was focussed upon the cornea unless otherwise stated. In all experi- 

 ments relating to the retina the pupil was previously dilated by a 

 mydriatic. In the experiments with the doul)le lens system the con- 

 junctiva was not directly exposed to the light so that the conjuncti- 

 vitis noted was largely secondary. The iris however was sometimes 

 more or less exposed. 



Experiments, 

 quartz mercury vapor lamp. crown glass screen (295 /iju). 



Distance 35 cm. 



Experiment 37. Exposed 20 minutes. No reaction. 



Experiment 38. Exposed 40 minutes. Little if any reaction. 



Experiment 39. Exposed 40 minutes. Little if any reaction. 



Experiment 40. Exposed 60 minutes. Moderate conjunctivitis. 

 Cornea clear. Iris congested. 



Distance 20 cm. 



Experiment 4L Exposed 1^ hours. Marked purulent conjuncti- 

 vitis. Cornea very hazy in central area. Iris congested and hem- 

 orrhagic. The conjunctivitis persisted about 10 days. The corneal 

 haze and a few minute iris hemorrhages were \isible over 4 weeks. 



MAGNETITE ARC. NO LENSES OR SCREENS. 



Experiment 42. Distance 50 cm. Exposed 6 minutes. Slight 

 conjunctivitis. Stippling of corneal surface without loss of epi- 

 thelium. (Liminal reaction.) 



Experiment 43. Distance 20 cm. Exposed 1 minute. Slight 

 conjunctivitis. Corneal epithelium intact. 



Experiment 44. Exposed 2| minutes. Moderate purulent con- 

 junctivitis. Cornea stippled but epithelium intact. 



Experiment 45. Exposed 4 minutes. Marked conjunctivitis with 

 edema and punctate hemorrhages. Cornea hazy and epithelium lost 

 from f of its surface. Microscopic examination (48 hrs.) shows 

 leucocytic infiltration of cornea, but corpuscles and endothelium 

 normal. Lens epithelium normal. 



Experiment 46. Exposed L5 minutes. Marked conjunctivitis. 

 Haze of cornea with loss of epithelium. Microscopic examination 



