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85. ----------------. [ARMSTRONG, E. F., AND HILDITCH, T. P.] Study of Catalytic Actions at Surfaces. XII. Some Observations Relative to Those Particles of a Catalyst Which Participate in Chemical Change. Proc. Roy. Soc. (London), vol. 108-A, 1925, pp. 111-120; Chem. Abs., vol. 19, 1925, p. 2443.