It is the consensus that vasectomy, performed for the purpose of sterilization of the male, is irrevocable. This belief is not without advantage in that it undoubtedly deters physicians from advising and laymen from requesting the operation, otherwise so inviting because of its simplicity and effectiveness. Bickham1 states that vasorrhaphy is occasionally performed in consequence of accidental cutting of the ductus deferens in the course of such operations as herniorrhaphy, a mishap which led Parlavecchio to attempt the first vas deferens anastomosis, according to Thorek.2 Reestablishment of continuity and patency of the vas deferens with restoration of fertility in patients previously vasectomized as a measure of contraception has been reported by Strode,3 Twyman and Nelson,4 Freiberg and Lepsky,5 Barker6 and Nelsen.7 These cases are of special interest because of the elapsed interval between the time of ligation