Note.–The following letter, received by the President, is published to correct mistakes made in the review of Jahrbuch 1937/38 der Deutschen Akademie der Luftfahrtforschung, published in the Journal for October, 1938. Every care is taken in reviewing- books received and the Editor is glad to have the opportunity of publishing the letter from Ministerial Director Herr A. Baeumker, Chancellor of the Deutschen Akademie de Luftfahrtforschung, to remove any misunderstanding. It should be noted that the Council are not responsible for any opinions expressed in any papers or reviews in the Journal, the responsibility for which ultimately is the Editor's unless otherwise stated