Nowhere is there a more fascinating field for the study of precancerous lesions than in the peculiar inflammatory conditions occasionally found in the vulva of old women. Only the comparative rarity of these conditions presents a bar to their satisfactory study. Those in the past who have based their views on one or two clinical observations, or who have not subjected their material to careful histologic study, have gone astray in their conclusions, and the confusion and difference of opinion that have been so marked in most of the articles written on this subject are largely due to this fact. The articles of Jayle and Bender in French, and Berkeley and Bonney in English literature deserve special consideration. My own material, gathered in the course of the past ten years, largely from the clinic of the Barnard Free Skin and Cancer Hospital (services of Dr. Gellhorn and myself) comprises thirty