Fourth letter from John David Griffith Davies, to Harold Spencer Jones, regarding a paper 'The Earth's magnetic field in Southern Africa at the epoch, 1 July 1930' by E N Grindley Sectional Committee: Not stated [Physics] There is no problem with printing the larger charts as folders, if he as the Communicator prfers it. This was not suggested initially as folders in bound volumes often get torn. [Published in the Philosophical Transactions of the Royal Society] No received date. 20 July 1945