1. Our experience with drip infusion pyelography and/or nephrotomography in a series of 110 patients is described. 2. Methylglucamine diatrizoate 60 per cent, diluted with an equal amount of 5 per cent glucose in water, has proved to be the contrast agent of choice because it provides reliable diagnostic contrast and is both safe and economical in use. 3. The indications for use of the DIP and DIN technique are given. 4. The drip infusion technique used in these studies has proved to be a valuable diagnostic tool and is advocated for use in any private or institutional radiology practice.