339.    ---------------. [BREDIG, G., AND CARTER, S. R.] [Equilibrium of the Reduction of Carbonic Acid to Formic Acid.]  Chem. Ztg., vol. 39, 1915, pp. 72-73; Chem. Abs., vol. 10, 1916, p. 1036.

                 Considerable amounts of free HCOOH are obtained by the action of H₂ and Pd black under pressure on CO₂ in the presence of H₂O; the HCOOH is decomposed catalytically into CO₂ and H₂.  The determination of the equilibrium between these reactions between 30°-90° gave no indication of the formation of HCHO as an intermediate product, so that it is unlikely that the formation of the latter is a stage in the assimilation of CO₂ in nature.