In looking over the literature on the pathology of cyst formation in the eye, one finds a mass of clinical and pathologic material. The first observations on the subject were purely clinical, and in the oldest cases of corneoscleral cysts a microscopic study of only the excised anterior wall of the cyst was made. The later observations show an abundance of material in which the whole eyeball was submitted for a minute histologic study. The employment of the slit-lamp as a means of clinical examination in the last few years brought out clinical observations on the topic as well. Nitsch1 described a case of a 5 year old boy with a tumor formation in the left eye. On the nasal part of the limbus was a cyst covering an area of 3 mm. of the cornea. The slit-lamp demonstrated clearly the two walls of the cyst being formed