Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to W. R. Bisschop Esq.; Dr Johnsons Buildings, Temple, E.C.4. With regard to W. R. Bisschop's enquiry from Professor van Leersum, suggests he ask van Leersum for further particulars, as it is unclear what the quoted passage (perhaps written by Leeuwenhoek) in his letter means. 4 December 1929