A cutaneous ureterostomy is described for sheep, which allows the continuous collection of urine without catheterization from conscious undisturbed animals.DURING studies on renal function in sheep a method was required for collecting urine continuously as it was formed. Catheterization of the bladder allows urine collection for only limited periods, and has the added disadvantage of frequently causing proteinuria. A cutaneous ureterostomy has, therefore, been developed by which normal urine can be collected for long periods from conscious undisturbed sheep.The transplantation of ureteral orifices, together with their surrounding bladder tissue, to the ventral abdominal wall was apparently first described for dogs by Hara [1922]. A technique of raising the ureteral orifice above the surface of the body wall by means of a skin tube, described for man [Schinagel and Sewell, 1948;Schinagel, 1948;Fish and Stevenson, 1949], was used by Hix [1955] in the dog to avoid constant soiling of the skin and to allow urine