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Two plane cubic curves-one of points and one of lines-can be so related that there is an infinity of triangles with points on the former and lines on the latter. I shall say that two such cubics are in triangular relation. This problem, which is investigated here, stands, in a way, between Poncelet's problem, with its various developments, and Klein's tetrahedra whose points and planes are on a Kummer quartic. The case when the two cubics are in apolarity occurs in the memoir by Prof. White, "doi:10.1112/plms/s2-4.1.384 fatcat:hum5k2hylvbubo7kpmim6apmdm