Successful homotransplantation of human tissue is a subject of great interest to the medical profession. Because widely diversified and conflicting theories still exist as to the efficacy of this procedure (since most of the important experimental work has been done on laboratory animals and the results may not always be similar in man), and inasmuch as these conflicting views have led to an attempt to evaluate homografting in man, this study was made. The preliminary report of this case appeared inThe Journal, Nov. 4, 1950.1Therein it was reported that the operation took place on June 17, 1950. At that time a kidney from a woman of approximately the same age, blood type, and Rh type as the patient was transplanted to the renal pedicle of the patient after the removal of a polycystic left kidney. An end-to-end anastomosis of the renal vessels and ureter around a catheter