Arteriography of nearly all the main arteries of the body, including the carotid, pulmonary and abdominal aorta, has been successfully performed. The latter vessels require special technics, but the procedure for those of the extremities, though exacting, is fairly simple. The study permits accurate visualization of the direction of the course of the arteries, the width of the lumen and the shape of the inner wall. Thus arteriography demonstrates the degree and level of arterial obstruction in the severe tissue nutritional disturbances of arteriosclerotic occlusion, embolism, Buerger's disease and large vessel trauma; the amount of collateral circulation; the site of arteriovenous aneurysms, and in simple arterial aneurysm the position of the sac and its patency or obstruction by thrombosis. It has therefore been employed in these conditions when in spite of the clinical observations, aided by oscillometry, skin surface temperature readings, histamine wheal tests and so on, finer delineation of