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Published online by Cambridge University Press: 03 November 2016
Besides the five regular solids, there are other polyhedra which satisfy some, but not all, the conditions of regularity as usually defined, and so may properly be termed semi-regular. Some of these, which have an interest both as geometrical figures and as naturally connected with the geometrical problems of the partition of space and of crystallography, I propose here briefly to discuss.
page 73 note * I have found it often convenient to use the shorter English words Twelve-Face, Fourteen-Face, etc., instead of the polysyllabic Greek Dodecahedron, Tetrakaide, kahedron, etc.
page 76 note * Cf. an interesting paper by Mrs. Bryant, D.Sc. (Proc. Lon. Math. Soc. xvi. No. 252), “On the Ideal Geometrical Form of Natural Cell-Structure.”