Referee's report by William John Macquorn Rankine, on a paper 'On the true theory of pressure as applied to elastic fluids' by R Moon Not recommended for publication in the 'Philosophical Transactions of the Royal Society'. Provides criticism of the paper and methodologies used, including the use of 'reductio ad absurdum'. Considers some of the conclusions to be contradictory. Subject: Physics and Chemistry [Published in the Proceedings of the Royal Society of London, 1863] 17 February 1863