A Unique Case of Reticular Pigmentation of the Skin with Atrophy. Presented by Dr. Engman. J. L., a man, aged 22, with no occupation, was first observed thirteen years ago, when he was 9 years old, and had a peculiar condition of the mouth which consisted of an ulcer on the left side of the tongue and a spot of leukoplakia on the right side of the tongue. This had existed for some months without obvious cause. No disturbance of the cutaneous surface was then noted. A brother, four years younger, had spots of leukoplakia on each side of the tongue. These spots in both patients were about 2 cm. long and 1 cm. wide on the lateral border of the tongue. The bacteriologic examination threw no light on the condition. The patient was not seen again until November, 1925, when he was in Barnes Hospital for an ulcer of