Referee's report by Sydney Chapman, on a paper 'The Earth's magnetic field in Southern Africa at the epoch, 1 July 1930' by E N Grindley Sectional Committee: Physics Recommended for publication in the 'Philosophical Transactions of the Royal Society'. As there is no chance of the paper being published in South Africa, it should be published by the Royal Society. The work will be valuable for the construction of navigation charts. Suggests reproducing the tables photographically, rather than the more expensive typeset. [Published in the Philosophical Transactions of the Royal Society] Endorsed on verso as received 12 February 1940. 8 February 1940