Referee's report by John Henry Poynting, on a paper 'On the forces, stresses, and fluxes of energy in the electromagnetic field' by Oliver Heaviside Recommended for publication in Philosophical Transactions, as the paper is of 'great importance'. However, the paper should be revised so it does not sounds so confusing. The referee wishes that the author 'could value that ordinary mortals cannot at all take in and assimilate long mathematical expressions that require some illustrations'. Subject: Physics [Published in Philosophical Transactions A, 1892]. 7 September 1891