In winding up with the paper of this evening a highly-successful session of the Aëronautical Society of Great Britain, the authors desire to express their appreciation of the honour of being invited to conclude the series of lectures and papers delivered during the last six months. They hope they will not be misunderstood wThen they venture to affirm that, both in the planning of the course to cover practically every section and in the high level of excellence of the individual papers, the present necessities and the future of the science ard practice of aeronautics have been admirably served.