CONSTRUCTION XV. THE BUTTRESS 209

difficulty in determining its fittest form. He has to deal with two distinct kinds: one, a narrow vertical pier, acting principally by its weight, and crowned by a pinnacle; the other, commonly called a Flying buttress, a cross bar set from such a pier (when detached from the building) against the main wall. This latter, then, is to be considered as a mere prop or shore, and its use by the Gothic architects might be illustrated by the supposition that we were to build all our houses with walls too thin to stand without wooden props outside, and then to substitute stone props for wooden ones. I have some doubts of the real dignity of such a proceeding, but at all events the merit of the form of the flying buttress depends on its faithfully and visibly performing this somewhat humble office; it is, therefore, in its purity, a mere sloping bar of stone, with an arch beneath it to carry its weight, that is to say, to prevent the action of gravity from in anywise deflecting it, or causing it to break downwards under the lateral thrust; it is thus found quite simple in Notre Dame of Paris, and in the Cathedral of Beauvais, while at Cologne the sloping bars are pierced with quatrefoils, and at Amiens with traceried arches. Both seem to me effeminate and false in principle; not, of course, that there is any occasion to make the flying buttress heavy, if a light one will answer the purpose; but it seems as if some security were sacrificed to ornament. At Amiens the arrangement is now seen to great disadvantage, for the early traceries have been replaced by base flamboyant ones, utterly weak and despicable. Of the degradations of the original form which took place in after times, I have spoken in Chap. II. § 8 of the Seven Lamps.¹

§ 11. The form of the common buttress must be familiar to the eye of every reader, sloping if low, and thrown into successive steps if they are to be carried to any considerable height. There is much dignity in them when they are of essential service; but, even in their best examples, their awkward angles are among the least manageable features of the

¹ [Vol. VIII. p. 64.]

IX. O

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