Paper, 'On certain definite integrals. No 12' by W H L [William Henry Leighton] Russell Russell presents a theorem which 'must be implicitly known, although I have never seen it in print'. Annotations in pencil and ink. Subject: Mathematics Received 8 December 1884. Read 18 December 1884, A version of this paper was published in volume 38 of the Proceedings of the Royal Society as 'On certain definite integrals'. 1884