I. Intestinal Obstruction Due to Volvulus or Adbesions of the Sigmoid Colon, with a Report of Five Cases, and a Study of the Etiological Factors: One Case of Recurrent Volvulus of Sixteen Years' Duration, Thirty-Two Attacks, Cured by Resection; Second, an Observation at Operation, of Acute Volvulus Seven Hours After the Onset of Symptoms.