On Jan. 11, 1955, a yearling Standard-bred stallion colt entered the Stange Memorial Clinic for treatment. The history stated that a rupture, present since birth, had been enlarging during the past month. The patient was examined and found to have a reducible swelling on the midline just anterior to the preputial orifice with a hernial ring approximately 1% inches in diameter. A diagnosis of umbilical hernia was made.