Referee's report by Nevill Francis Mott, on a paper 'Some properties of the metallic state II—Metallic hydrogen and deuterium' by Alfred Rene Jean Paul Ubbelohde Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. The experimental results should be set out together, separate from the theoretical deductions. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 30 December 1936. nd [December 1936]