Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to W. G. Perrin, Esq., The Admiralty, SW Replies that the Library does not have the pamphlets W. G. Perrin is after. Suggests 'Ciel et Terre' (1885) for Mahillon's pamphlet, which can be found in the Library of the Royal Astronomical Society. States the Royal Geographical Society may be able to help locate a copy of Chancourtois's 'Programme Raisonne'. 4 November 1926