Several decades ago arsenic was alleged to be a normal constituent of the body,1 but that claim has been much disputed. In recent times through the investigations of Throne and Myers2 and their co-workers and others3 renewed interest has been aroused in the occurrence of arsenic in the tissues and excretions of the body both in health and in disease. This work has emphasized the widespread use of arsenic and the countless possibilities for its absorption into the body. Water, dust, soil, food, drugs and articles of wearing apparel and of household use apparently are all potential sources of arsenic poisoning. Fordyce, Rosen and Myers2a showed that arsenic is found "normally" in a large number of persons, depending on the character of their food, drink, medication and environment. Later, as a result of tests made on a large series of normal persons, Myers and Cornwall2b