254.    ---------------. [BERTHELOT, M.] [Study of Chemical Reactions.]  Ann. Chim. Phys., vol. 6, 1905, (8), p. 183; Compt. Rend., vol. 140, 1905, pp. 905-914; Jour. Chem. Soc., vol. 88, 1905, (2), p. 308A.

                  Attempt was made to cause the direct synthesis C+2H₂=CH₄ by passing H₂ through quartz tubes heated to 1,300°.  Results were negative although Bone and Jerdan had effected the direct synthesis at 1,200° over pure-sugar C (abs. 296).