The use of iodized oil in bronchography and in the treatment of bronchiectasis has become widespread during the past few years. While it is generally considered that this procedure is not attended by serious consequences, there are possible dangers which have been described by several authors, among them Archibald and Brown1 and Hedblom.2 There has also been confusion on the question of how long the oil remains in the lung and how the lung disposes of it. Recently I performed the operation of lobectomy on two patients with bronchiectasis (figs. 1 and 2) who had been treated with injections of iodized poppy seed oil 40 per cent for some time previous to operation. The lungs of both of these patients have been carefully examined for the presence and distribution of the oil. These data together with experimental work on animals are presented for the purpose of clarifying some