52 THE STONES OF VENICE

marble being used to emphasize the centre of the chain, exactly as a painter would use a dark touch for a similar purpose.

§ 22. And now, with a little trouble, we can set before the reader, at a glance, the arrangement of the groups along the entire extremity of the church.

There are thirteen recesses, indicative of thirteen arches; seen in the ground plan, fig. 2, Plate 1. Of these, the second and twelfth arches rise higher than the rest; so high as to break the decorated band; and the groups of triangles we have to enumerate are, therefore, only eleven in number; one above each of the eleven low arches. And of these eleven, the first and second, tenth and eleventh, are at the ends of the aisles; while the third to the ninth, inclusive, go round the apse. Thus, in the following table, the numerals indicate the place of each entire group (counting from the south to the north side of the church, or from left to right), and the letters indicate the species of triangle of which it is composed, as described in the list given above.

6. h. i. h. g. h. i. h.

5. b. c. a. d. a. c. b.7. b. c. a. d. a. c. b.

4. b. a. b. c. a. e. a.8. a. e. a. c. b. a. b.

3. b. a. b. e. b. a.9. a. b. e. b. a. b.

2. a. b. c.10. a. b. c. b.

1. a. b. c. b. a.11. b. a. c. a. f. a. a.

The central group is put first, that it may be seen how the series on the two sides of the apse answer each other. It was a very curious freak to insert the triangle e, in the outermost place but one of both the fourth and eighth sides of the apse, and in the outermost but two in the third and ninth; in neither case having any balance to it in its own group, and the real balance being only effected on the other side of the apse, which it is impossible that any one should see at the same time. This is one of the curious pieces of system which so often occur in mediæval work, of which the key is now lost. The groups at the ends of the transepts correspond neither in number nor arrangement; we shall presently see why, but must first examine more closely the

[Version 0.04: March 2008]