Derris root or its extractives have been available in the United States for many years. In September 1911 the McDougalls applied for the first United States patent for its use as an ingredient for animal washes, insecticides and vermifuges1. The first reference to this root as an allergen was made by Westen2 in 1937, when he reported improvement in two cases of bronchial asthma from exclusion of this substance from the environment. The sole reference revealed by a careful survey of the literature to derris as a cause of dermatitis was that of Racouchot3 in 1939. Haag4 states that he has on several occasions had inquiries about workers with derris who had contracted cutaneous lesions, but in none of these was the specific nature of the eruption given. From the information he received he was unable to ascertain the exact nature of the eruption.