Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to the Librarian of the Rothamsted Experimental Station; Herpenden, Herts Informs the Librarian that the author of the book in question was Nicolas Fatio de Duillier, FRS. Notes that his name is sometimes written Facio. Further notes that the Society do not possess the book, though they ought to. 16 February 1923