Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to [Henry Reginald Arnulph] Mallock Esquire, FRS Informs Mr. [Henry Reginald Arnulph] Mallock that the two volumes of Smith's British Diatoms that the Society borrowed from the Linnean Society on his behalf are needed back at the Linnean Society. Asks him to return them at his earliest convenience. 18 May 1922