754 VERHOEFF AND BELL. 



cadmium-zinc arc through a quartz lens (no water-cell or screen of 

 any kind being used). 



October 22, the right eye shows intense inflammatory reaction, with 

 a large abscess of the cornea and pus in the anterior chamber. The 

 left eye shows equally intense inflammatory reaction and a corneal 

 abscess about half the size of that in the right cornea. The abscess 

 shows discrete points evidently corresponding to colonies of bacteria. 



October 23, abscesses of the two corneas are now about equal in 

 size, (3 mm. in diameter). The anterior chamber of each eye contains 

 pus. Epithelium is entirely absent from the left cornea (this being 

 confirmed by microscopic examination). The right cornea shows loss 

 of epithelium onlj- in the vicinity of the abscess. Enucleation is 

 performed. 



The lens capsule of the right eye after fixation in Zenker's fluid is 

 examined in flat preparation and shows slight changes in the nuclei of 

 the epithelium evidently due to the action of staphylococcus toxins, 

 but no changes similar to those seen after exposure to ultraviolet light. 

 The lens capsule of the left eye shows, in addition to these nuclear 

 changes, well-marked changes characteristic of exposure to ultraviolet 

 light — swelling and granular degeneration of the cytoplasm of the 

 epithelial cells. Histologically both corneas present the same picture, 

 and each contains numerous large masses of staphylococci. 



Experiment 4. Feb. 8, 1913, a suspension of Staphylococcus aureus 

 in distilled water is injected into each cornea of a rabbit. The left 

 cornea is then exposed for thirty minutes to the cadmium-zinc arc 

 through a crown screen and quartz lens, the image being kept on the 

 injected area. 



February 10, there are abscesses of equal size in the two corneas. 

 The left eye in addition shows severe photophthalmia with marked 

 general haze of cornea and large central loss of epithelium which in- 

 cludes area of abscess. This eye also shows exudate adherent to 

 the posterior surface of the cornea behind the site of the abscess, 

 due e\idently to injury of the endothelium by the ultraviolet light. 

 Enucleation is performed. 



The lens capsule of the left eye, after fixation in Zenker's fluid, is 

 examined microscopically in flat preparation, and shows marked 

 changes characteristic of exposure to ultraviolet light. 



Experiment 5. March 19, 1913, a suspension of Staphylococcus 

 aureus in distilled water is injected into the cornea of a rabbit. The 

 cornea is then exposed to the magnetite arc for forty-five minutes 

 through the quartz lens, quartz water-cell, and crown screen. This 

 exposure in the case of normal eyes had been found sufficient to cause 



