Referee's report by Arthur Stanley Eddington, on a paper 'An investigation into the periodicity of measles epidemics in London from 1703 to the present day by the method of the periodogram' by John Brownlee Sectional Committee: Physiology Recommended for publication in the 'Philosophical Transactions of the Royal Society'. The paper adds value to the author's previous papers. [Published in the Philosophical Transactions of the Royal Society B, 1918] Endorsed on verso as received 22 December 1917. [December 1917]