Age, sex, pregnancy and menstruation have no effect on the urinary excretion of auxin-a. Cancerous and tuberculosis patients showed no abnormal excretion, dia betics showed increased excretion probably due to high-fat diets. Added olive oil, arachis oil and butter fat (to some extent) caused an increased excretion in normals. Various animal organs and tissues contain auxin-a, which, with auxin-b was isolated from certain vegetable oils. Cancer-tissue contained unusually large amts. of plant growth-stimulating substances, both auxins and "bios.".