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Exposure of the whole body to moderate doses of X-rays in the rat, rabbit and cat has been shown to reduce the adrenaline and noradrenaline content of the adrenal gland (Goodall & Long, 1959). The present experiments were performed to determine whether X-irradiation exerts a selective effect on the secretory function of the adrenal medulla.

Adult mongrel dogs weighing 9·8–16·3 kg were used. The left adrenal gland was exposed by the lumbar route under pentobarbitone anaesthesia by the method of Satake, Sugawara & Watanabe (1927). Simultaneously the left adrenal vein was cannulated and the left splanchnic nerves were sectioned. The exposed adrenal gland was then irradiated with 200–5000 R of X-rays. The X-ray characteristics were: 180 kV peak, 20 mA, focus—surface distance 37 cm, and half-value-layer 1·0 mm Cu. Dose-rate to the adrenal gland was approximately 130 R/min. Samples of adrenal venous blood were collected 30 and 10 min before,