Referee's report by John Wesley Judd, on a paper 'On the agency of water in volcanic eruptions; with some observations on the thickness of the Earth's crust from a geological point of view; and on the primary cause of volcanic action' by Joseph Prestwich Recommended for publication in Philosophical Transactions. Although the paper is of 'somewhat speculative character', it 'contains discussions of much importance, based on well arranged facts'. Subject: Geology [Published in Proceedings of the Royal Society, 1886]. 26 May 1885