1891 saw him also appointed to the professorship of Geometry at Gresham College; here he met Walter Frank Raphael Weldon, a zoologist who had some interesting problems requiring quantitative solutions.
År 1891 utnämndes han till professor i geometri vid Gresham College, där han träffade Walter Frank Raphael Weldon, en zoolog som hade några intressanta problem som rörde kvantitativa lösningar.