3481.     ---------------.  [TSUTSUMI, S.]  Production of Carbon Monoxide and Hydrogen by Means of the Methane-Steam Reaction.  IV.  Nickel Sulfate as a Catalyst.  Jour. Chem. Soc. Japan, vol. 58, 1937, pp. 1007-1012; Chem. Abs., vol. 32, 1938, p. 735.