The paper reports on examinations relating to vascular morphology, flow rate and kidney size in patients suffering from arterial hypertension. 2. The results and findings differ clearly from those of the total group of patients and a control group of healthy volunteers. 3. The results and observations are discussed. 4. Renal angiography can give more information than commonly assumed. Hence it should be employed more frequently than before for the purpose of clarifying diagnosis in patients with arterial hypertension.