Referee's report by John Edward Lennard-Jones, on a paper 'On the theory of finite deformations of elastic crystals' by R Fürth Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. It ought to be stated that the calculations refer to crystals at absolute zero. Refers to work of Francis Dominic Murnaghan. Criticises the unclear use of tables. Contains extra question - 'Is there any information contained in the paper which likely to be of value to the enemy?' Referee replies no. [Published in the 'Proceedings of the Royal Society of London'] No received date. [1941]