Copy letter from Michael Foster and Arthur William Rucker, to the President of the National Academy of Sciences, Washington, U.S.A. On the 17 November last year the President of the Royal Society sent a letter to the Academie des Sciences of Paris, the Reale Accademia dei Lincei of Rome, ad the Academie Imperiale des Sciences of St Petersburg in reference to a proposal that the leading Academies should meet at intervals to discuss matters which might demand international co-operation. A similar letter was subsequently addressed to the National Academy of Sciences of Washington. The letter was written in consequence of what had taken place at a meeting of German Academies at Gottingen in June [1898] at which representatives of the Royal Society were present. Refers to an invitation to a meeting at Wiesbaden on 9 and 10 October, which is intended to be a preliminary one for the purpose of discussing the mode in which such an Association of Academies can be best organized. [Also addressed to the Academie [Imperiale] des Sciences, St Petersburg; Academie des Sciences l'Insititut, Paris; and Reale [Accademie] dei Lincei, Rome] 31 May 1899