Second letter from John David Griffith Davies, to Edward Victor Appleton, regarding a paper 'Supersonic dispersion in gases II. Air containing water vapour' by M Mokhtar and E G Richardson Sectional Committee: Physics The paper previously refereed as not to be published during wartime, is being printed in a limited number to be made available to Government Departments if required. Asks if the Department of Scientific and Industrial Research (UK) wish to have any copies. Also asks if any other Government Departments should be contacted. [Published in the 'Proceedings of the Royal Society of London'] No received date. 29 February 1940