Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to an unknown correspondent Encloses the recipient's paper on the Capillary Phenomena in Blood Cells [not enclosed]. Informs the recipient that he has been directed to return this paper by the Physiological Committee, on the grounds that his theory of the cause of ingestion of particles appears to be opposed to the fact that when the surface tension of the interface between oil and water is lowered by the use of an emulsifying agent, ingestion is facilitated. 18 February 1916