Describes the earliest experiments with artificial pneumoperitoneum by Mosetig-Moorhof, Duran and Nolen and Folet, which were not published formally. See Jean-Jacques Peumery, "1993: Le centenaire du penumopéritoine artificiel," Histoire des sciences médicales, 28 (3), 1994, 211-216. This paper is available from biusante.parisdescartes.fr at this link.