Letter from Olaus Magnus Friedrich Erdmann Henrici, on a paper 'Octonions' by Alex McAulay to the Secretary of the Royal Society He apologises for holding the paper for so long and that is report isn't as full as it should be. The paper is long and on a somewhat new subject and is written in a 'crude form' which makes it difficult to read. The paper should be published in Philosophical Transactions, in full, as the abstract alone doesn't give a good enough idea of the paper. All diagrams should also be published. Subject: Mathematics [Published in Proceedings of the Royal Society, 1895]. 4 February 1896