Cut a piece of stiff paper six inches square. Fold paper from A D, then from B C, making creases. Place points A, B, D, C, successively, to centre O, making creases da, etc. Fold points A, B, D, and C respectively, to f, g, h, and e, making creases op, ij, Ik, and mn. Make creases ni,pl, jm, and k o. Cut out small triangles, indicated by creases whose bases are ia, ap, lb, bj, mc, ck, od, dn. Cut slits

Fig. ii. — Box Square creased for cutting.

Fig. 12. — Box Square ready for folding.

in middle of lines pl, jm. Cut slits from points k, o, n, and i, towards y and x. Cut lines op, lk, to u, r, s, t.

The paper now appears as in Fig. 12. Fold rs, st, tu, u r, with a sharp crease, so as to make a right angle. The square r s t u forms the bottom of the box. Fold ab, be, cd, da, in same manner. The loose squares formed in cutting paper to r, s, t, and u, fold to the inside of box. The points A and C are folded, and stuck through slits at mj and p l, and the box is complete.