48 THE STONES OF VENICE

one of the first and most curious instances of it. The proportions above given of the nave and aisles might have been dictated by a mere love of mathematical precision; but those of the apse could only have resulted from a true love of harmony.

In fig. 6, Plate 1, the plan of this part of the church is given on a large scale, showing that its seven external sides are arranged on a line less than a semicircle, so that if the figure were completed, it would have sixteen sides; and it will be observed also, that the seven sides are arranged in four magnitudes, the widest being the central one. The brickwork is so much worn away, that the measures of the arches are not easily ascertainable, but those of the plinth on which they stand, which is nearly uninjured, may be obtained accurately. This plinth is indicated by the open line in the ground plan, and its sides measure respectively:

Ft. In

1st, a b in plan67

2nd, b c77

3rd, c d75

4th, d e (central) 710

5th, e f75

6th, f g78

7th, g h610

§ 16. Now observe what subtle feeling is indicated by this delicacy of proportion. How fine must the perceptions of grace have been in those builders who could not be content without some change between the second and third, the fifth and sixth terms of proportion, such as should oppose the general direction of its cadence, and yet were content with a diminution of two inches on a breadth of seven feet and a half ! For I do not suppose that the reader will think the curious lessening of the third and fifth arch a matter of accident, and even if he did so, I shall be able to prove to him hereafter that it was not, but that the early builders were always desirous of obtaining some alternate proportion of this kind.¹ The relations of

¹ [See below, ch. v. §§ 6-12, and especially p. 153.]

[Version 0.04: March 2008]