932.    FINKELSHTEIN, V. S., AND RUBANIK, M. Y.  [Kinetics of Ammonia Synthesis by Technical Iron Catalysts.]  Jour. Phys. Chem. (U.S.S.R.), vol. 6, 1935, pp. 1051-1058; Acta Physicochim, U.S.S.R., vol. 3, 1935, pp. 945-956; Chem. Abs., vol. 30, 1936, p. 7286.

     Apparent energy of activation of NH3 formation was 21 cal. per mol.  Considering the various reaction energies required, it seems that the primary step in NH3 synthesis is not nitride but imide formation by direct union of N and H.