Referee's report by Ralph Howard Fowler, on a paper 'The thermodynamics of magnetization' by Edward Armand Guggenheim Sectional Committee: Mathematics Recommended for publication in the 'Proceedings of the Royal Society of London'. Criticises the use of rational units, and that this sort of work should 'stick to ordinary electrostatic or electromagnetic units'. Criticises the choice of notation. Comments on the experimental method. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 13 January 1936. [January 1936]