80.     ----------------. [ARMSTRONG, E. F., AND HILDITCH, T. P.] Study of Catalytic Actions at Surfaces.  VII.  Influence of Pressure on the Rate of Hydrogenation of Liquids in Presence of Nickel.  Proc. Roy. Soc. (London), vol. 100-A, 1921, pp. 240-252; Chem. Abs., vol. 16, 1922, p. 1348.