3460.     TROPSCH, H., AND SCHELLENBERG, A.  [Formation of Methane in the Water-Gas Process.]  Brennstoff-Chem., vol. 3, 1922, pp. 33-37; Ges. Abhandl. Kenntnis Kohle, vol. 6, 1921, pp. 317-329; Chem. Abs., vol. 16, 1922, p. 2022.

        Vignon’s experiments (abs. 3560, 3561, 3562, 3563), on the reduction of CO to CH4 by means of H2 in the presence of CaO and Fe, at 900°-1,000° have been repeated and only traces of CH4 found.  The presence of 25-30% CH4 among the products of dry distillation of Ca(HCOO)2 could likewise not be confirmed.  Vignon apparently determined CH4 by difference and did not allow for residual N2 in the apparatus.