In four experiments, Dr. B. removed the left kidney of the rabbit, by incision on the outer edge. Ligatures were applied to prevent bleeding. Two died; one in 60 hours, the other in 4-1/2 days: both of inflammation. One recovered, and lived 5 or 6 weeks, and then died. The 4th also recovered, but died in 5 or 6 weeks. On examination, a sac was found (in place of the kidney) filled with a semi-fluid substance, resembling custard, p. 4. In seven rabbits, removed the spleen. One recovered permanently, and one lived six months. p. 5. In five rabbits, opened the abdomen, and punctured the fundus of the bladder with a lancet. Three of them recovered entirely. p. 6. In two rabbits, cut off one-fourth of the bladder with scissors, having applied a ligature first. One died in seven months; the other still lives in good health. Into the peritoneum of four rabbits, threw [Symbol: ounce]i of human urine; then washed it out by injecting tepid water. One died of collapse in less than 24 hours, and two of inflammation, in 60 and 19 hours respectively. The fourth is now (12 months) in good health. p. 7. In seven, injected [Symbol: ounce]xi decoct. quercus into the peritoneum. Only one recovered. Dr. B.'s inferences from the foregoing experiments are: 1st. "Large apertures into the peritoneum of the rabbit, do not immediately induce a dangerous prostration, of strength." p. 9. 2ndly. "Large apertures into the peritoneal sac of the rabbit, are not necessary, nor perhaps generally, productive of fatal inflammation." 3dly. "In the rabbit, the kidney, the spleen, and a large piece of the bladder may be extirpated, without necessarily causing death; though death under the first operation is probable." p. 10. 4thly. "When the abdomen is laid open, and parts are removed from it in the rabbit, the first danger arises apparently from collapse; the second from general inflammation; and the last from chronic disease." (Vide experiments.) 5thly. "The rabbit's abdomen is very tender, probably no less so than that of man." See exper. 6thly. "Success in abdominal operations on the rabbit, furnishes a presumption in favour of success in similar operations on the human abdomen; and, therefore, from these experiments, we may infer, _presumptively_, that moderate openings into the human peritoneum will not necessarily, nor even generally prove fatal from inflammation or otherwise; and further, that certain viscera or parts of viscera, not essential to the welfare of our structure, may be removed from the belly, without necessarily, or even generally, producing death. The extirpation of the kidney must be highly dangerous; but there is a presumption in favour of the successful removal of the spleen, the ovaries, or even of large pieces of the bladder." p. 11, 12.