An account is given of experiences in renal angiography covering a ten-year period and 1750 patients. There has been no mortality and an exceedingly small morbidity from this procedure: in almost all instances the Seldinger technique was used with a general anaesthetic. A review of the literature on complications of aortography is given, from which it can be seen that some much larger series have shown a similarly minute morbidity. The value of the procedure in hypertension is illustrated by various examples of renovascular and renal disorder. It is suggested that renal angiography is a safe and useful procedure, especially in the investigation of hypertension.