Bowen's Precancerous Dermatosis. Presented by Dr. Fraser for Dr. Schwartz. (From the Cornell Clinic.) A man, aged 59, American by birth, gave a history of having taken arsenic over a period of eight years (from the age of 7 to 15) for the relief of chorea. The duration of the skin condition was forty-five years. Examination showed numerous irregularly shaped, scaly, flat, reddish-brown patches ranging in size from that of a pinhead to one half inch (1.27 cm.) or more in diameter. Almost all the lesions were discrete, but in certain areas, especially on the back, there was a tendency to confluence. The majority were macular; some were slightly raised and a few were definitely nodular in type. The palms and soles were smooth, and with the exception of a small area under the left eye, the face was free from lesions. The case was presented as a possible example