Experimental Surgery.
—Perlmann and Kairis1 report on resection of the kidney and transplantation of hemostatic tissue. Berti, in 1921, collected ninety-five cases of resection of the kidney; seventy-four patients were cured, seven were not cured, seven died, and in seven cases secondary nephrectomy was performed. Tuffier was the first to show, by animal experimentation, how small a portion of renal substance is necessary to support life. For animals, 1.5 Gm. for each kilogram of body weight is sufficient; for man, from 80 to 150 Gm. is necessary (Kümmell).Four groups of experiments were performed. In the first group, from one fourth to one third of one kidney was resected, and the parenchymal wound packed with muscle or fat tissue. From six to twenty-seven days later, the opposite kidney was removed. Later the dogs were killed, and the resected kidney examined. In the second group, nephrectomy was performed first