pp. 271–274. (Google Books) Rev. Hamnet Holditch, "On Double Tangents", The Quarterly Journal of Pure and Applied Mathematics, vol. 4, London, 1861, pp. 28–44. (Google Books) Rev. Hamnet Holditch, "On a Magic Square", The Quarterly Journal of Pure and Applied Mathematics, vol. 6, London, 1864, pp. 181–189. (Google Books) References The Last Will and Testament of Hamnet Holditch 1800 births 1867 deaths Senior Wranglers Fellows of Gonville and Caius College, Cambridge Geometers 19th-century English mathematicians