Referee's report by George Howard Darwin, on a paper 'On the relation between tropical and extra-tropical cyclones' by Ralph Abercromby Not recommended for publication in the 'Philosophical Transactions of the Royal Society'. The theorising in the paper is 'open to serious criticism'. Some of the statements made are too vague to be meaningful. The author does not seem to understand vortex motion. If the author condenses and modifies the manuscript, to make it a statement regarding differences between temperate and tropical latitudes, and removing the theoretical parts, it might be suitable for the Proceedings. Subject: Meteorology [Published in the 'Proceedings of the Royal Society of London', 1888] 22 February 1887