CH. IV THE LAMP OF BEAUTY 145

that all perfectly beautiful forms must be composed of curves; since there is hardly any common natural form in which it is possible to discover a straight line. Nevertheless, Architecture, having necessarily to deal with straight lines essential to its purposes in many instances and to the expression of its power in others, must frequently be content with that measure of beauty which is consistent with such primal forms; and we may presume that utmost measure of beauty to have been attained when the arrangements of such lines are consistent with the most frequent natural groupings of them we can discover, although, to find right lines in nature at all, we may be compelled to do violence to her finished work, break through the sculptured and coloured surfaces of her crags, and examine the processes of their crystallisation.

§ 7. I have just convicted the Greek fret of ugliness, because it has no precedent to allege for its arrangement except an artificial form of a rare metal. Let us bring into court an ornament of the Lombard architects, Plate XII., fig. 7, as exclusively composed of right lines as the other, only, observe, with the noble element of shadow added. This ornament, taken from the front of the Cathedral of Pisa, is universal throughout the Lombard churches of Pisa, Lucca, Pistoja, and Florence; and it will be a grave stain upon them if it cannot be defended. Its first apology for itself, made in a hurry, sounds marvellously like the Greek one, and highly dubious. It says that its terminal contour is the very image of a carefully prepared artificial crystal of common salt.¹ Salt being, however, a substance considerably more familiar to us than bismuth, the chances are somewhat in favour of the accused Lombard ornament already. But it has more to say for itself, and more to the purpose; namely, that its main outline is one not only of natural crystallisation, but among the very first and commonest of crystalline forms, being the primal condition of the occurrence of the oxides of iron, copper, and tin, of the sulphurets of iron and lead, of fluor spar, etc.; and that those projecting forms in its surface

¹ [Cf. above, pp. 96 n., 143.]

VIII. K

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