234.    ---------------. [ BERTHELOT, C.] [Realizable Progress in Hydrogenation.]  Génie Civil, vol. 110, 1937, pp. 53-60, 86-90; Chem. Abs., vol. 31, 1937, p. 4082.

                  Deals mainly with researches in progress with a view to reducing the cost of gasoline made by direct hydrogenation of coal or lignite.  Description is given with illustration of an intermittent conversion plant used at a Pas-de-Calais colliery to produce the gas mixture required by the Fischer process.