Copy letter from [Robert William Frederick Harrison, Assistant Secretary of the Royal Society]; to F. J. Selby, Secretary of the Advisory Committee for Aeronautics 'Replying to your note of yesterday, as far as I know at present it will be convenient for you to have the use of a room at the Royal Society for the following meeting of the Advisory Committee on Aeronautics:- Aerodynamics Sub-Committee, March 4th, 2.30pm Engine Sub-Committee, March 11th, 11am Advisory Committee, March 11th, 3pm.' 15 February 1919