Letter from John David Griffith Davies, to Reginald Edward Stradling, regarding a paper 'Some cases of the steady two-dimensional percolation of water through ground' by B Davison and Louis Rosenhead Sectional Committee: Mathematics Alfred Charles Glyn Egerton has asked for this paper to be referred to him, asking whether the paper could be passed as safe for publication, and not giving out information which may be of value to the enemy. The paper has been refereed regarding the mathematics, but it is desirable to know if the applications make it worthy of publication. [Published in the 'Proceedings of the Royal Society of London'] No received date. 7 February 1940