Paper, 'A memoir on curves of the third order' by A [Arthur] Cayley 55 manuscript pages including one figure. Subject: Mathematics Published in Philosophical Transactions as 'A memoir on curves of the third order'. Received by the Royal Society on 30 October 1856. Read 11 December 1856. Abstract published in Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society of London], Volume 8, 1857. [1856]