In 1933, Vickery, Pucher, Wakeman, and Leavenworth (?) reported the formation of nitrate in tobacco leaves subjected, in the absence of light, to either air drying or distilled water culture. The present investigation seeks to extend this unprecedented (1) observation to leaves other than those of the tobacco; for this purpose random choice was made of Swiss chard (Beta vulgaris var. cicla) and tomato Lycopersicum esculentum Mill)? The treatment of the leaves followed as closely as possible that given the tobacco ; the results so obtained indicate that the tobacco is not unique in showing nitrate formation and that the phenomenon differs in magnitude depending upon the nature of the leaf and its condition.