Referee's report by James Walker, on a paper 'On the polymorphic changes of ammonium nitrate' by U Behn Sectional Committee: Physics and Chemistry Recommended for publication in the 'Proceedings of the Royal Society of London'. Suggests paper requires a little editing, and some of the illustrations are not necessary. Note on side by Joseph Larmor suggests sending to Arthur Schuster for possible editing, and to omit noted diagrams. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 6 September 1907. [September 1907]