Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to C. F. Pond Esq., University Press, Cambridge Informs C. F. Pond to expect permission to reproduce in the new edition of 'The conduction of electricity through gases', figure 1 in Proceedings A.81 [the paper is 'The charges on ions in gases, and the effect of water vapour on the motion of negative ions']. Subject to consent of the author, Prof. [John Sealy Edward] Townsend. 16 April 1928