955.    ---------------.  [FISCHER, F.]   [Solved and Unsolved Problems in Coal Investigation.]  Brennstoff-Chem., vol. 10, 1929, pp. 444-447; Ges. Abhandl. Kenntnis Kohle, vol. 9, 1930, pp. 450-459; Chem. Abs., vol. 24, 1930, p. 2859.

     Chemical and biological problems encountered in the study of coal constitution are touched upon, and work on the complete gasification of coal is mentioned.  The ideal here, not yet realized, is practical conversion of coal into O2-free (except for CO) combustible gases.  Recent research at Mülheim has aimed at complete technical purification, mainly desulfurization, of water gas and catalytic conversion of this into liquid hydrocarbons.  Considerable work also is being done on the re-forming of fuel gases.