"The transplantation in mass of the kidneys consisted of extirpating from a first animal both kidneys, their vessels and the corresponding segments of the aorta and vena cava, their nerves and nervous ganglia, their ureters and the corresponding part of the bladder; of placing this anatomic specimen in the abdominal cavity of a second animal whose normal kidneys had been previously resected and the aorta and vena cava cut transversely; and also of suturing the vascular segments between the ends of the aorta and vena cava, and of grafting the flap of the bladder on to the bladder of the host."