2752.     PRING, J. N., AND HUTTON, R. S.  Direct Union of Carbon and Hydrogen at High Temperatures.  Jour. Chem. Soc., vol. 89, 1906, pp. 1591-1601; Proc. Chem. Soc., vol. 22, 1906, p. 260; Chem. Abs., vol. 1, 1907, pp. 178, 550.

        Purest C rods on being heated in H₂ gave about 0.25% CH₄ at 1,200°-1,350°, 0.4% at 1,700°, and about 1% at 2,700°.  (See Bone and Jerdan, Jour. Chem. Soc., vol. 71, 1897, p. 41; vol. 79, 1901, p. 1042.)  Traces of C₂H₂ were formed at 1,700°, measurable quantities at 1,800°, 0.88% at 2,000°, 3.35-4.2% at 2,500°, and 2.75-3.03% at 2,700°.