Manuscript, 'A memoir upon caustics' by A [Arthur] Cayley Subject: Mathematics Published in Philosophical Transactions as 'A memoir upon caustics'. Written by Cayley at 2 Stone Buildings [Lincoln's Inn, London]. Received by the Royal Society on 1 May 1856. Read 8 May 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]