By Mortenson M.

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Though the scope is broad (encompassing group theory, combinatorics, and collateral fields), much of the material is presented in detail, and may be new even to specialists. Of interest to research mathematicians as' well as geometry teachers and advanced students, The Geome,tric Vein combines material of intuitive interest with a strong aesthetic appeal. /217 iUus.

G is the familiar "great icosahedron", and is obtained by filling up the rhombic depressions with the wedges gl, and covering the spikes with the pentagrammatic sheaths g2; it has 60 isosceles triangular depressions, each between two pieces g2 and one piece gl. PLATE III. H is obtained by inserting into each of these depressions a very long tapering spike, of isosceles triangular section; each spike has just one plane of symmetry. They fall into fairly marked clusters of five, and also into rings of six, their extreme vertices being very nearly those of a truncated icosahedron.

F. Fig. 9 These pieces combine with the ditrigonal spikes el to form triangular spikes, whose section near a vertex is shown in Fig. 9. (e£. Fig. ) Of each of these spikes the outer and more acute triangular pyramid is set on obliquely to the inverted and more obtuse, forming something rather like a trigonal trapezohedron, save for the difference in acuteness. Finally, the figure Delf l is easily grasped, either by imagining the 60 pieces fl added to Del, or the 20 pieces elf l to D, or (perhaps the most instructively) the pentagrammatic sheaths e2 removed from the simple and important figure of five tetrahedra, Efl (Plate XVI), leaving the characteristic pentagrammatic depressions.