Meeting of the Society was held at the Royal Society of Arts on Thursday, March ist, 1923, Professor L. Bairstow, C.B.E., F.R.S., in the chair. The Chairman, in calling upon Major F. M. Green to read his paper on “ Air Travel, with Special Reference to the Helicopter,” said that many of those present would be able to> agree with the very critical review of the problem given by the lecturer, and it would be an advantage perhaps to the progress of aviation if the Society gave a technical opinion as to the value of the helicopter as a means of air travel.