Now, to return to our immediate subject, it so happens that, in architecture, the superinduced and accidental beauty is most commonly inconsistent with the preservation of original character, and the picturesque is therefore sought in ruin, and supposed to consist in decay.  Whereas, even when so sought, it consists in the mere sublimity of the rents, or fractures, or stains, or vegetation, which assimilate the architecture with the work of Nature, and bestow upon it those circumstances of colour and form which are universally beloved by the eye of man.  So far as this is done, to the extinction of the true characters of the architecture, it is picturesque, and the artist who looks to the stem of the ivy instead of the shaft of the pillar, is carrying out in more daring freedom the debased sculptor’s choice of the hair instead of the countenance.  But so far as it can be rendered consistent with the inherent character, the picturesque or extraneous sublimity of architecture has just this of nobler function in it than that of any other object whatsoever, that it is an exponent of age, of that in which, as has been said, the greatest glory of the building consists; and, therefore, the external signs of this glory, having power and purpose greater than any belonging to their mere sensible beauty, may be considered as taking rank among pure and essential characters; so essential to my mind, that I think a building cannot be considered as in its prime until four or five centuries have passed over it; and that the entire choice and arrangement of its details should have reference to their appearance after that period, so that none should be admitted which would suffer material injury either by the weather-staining, or the mechanical degradation which the lapse of such a period would necessitate.

It is not my purpose to enter into any of the questions which the application of this principle involves.  They are of too great interest and complexity to be even touched upon within my present limits, but this is broadly to be noticed, that those styles of architecture which are picturesque in the sense above explained with respect to sculpture, that is to say, whose decoration depends on the arrangement of points of shade rather than on purity of outline, do not suffer, but commonly gain in richness of effect when their details are partly worn away; hence such styles, pre-eminently that of French Gothic, should always be adopted when the materials to be employed are liable to degradation, as brick, sandstone, or soft limestone; and styles in any degree dependent on purity of line, as the Italian Gothic, must be practised altogether in hard and undecomposing materials, granite, serpentine, or crystalline marbles.  There can be no doubt that the nature of the accessible materials influenced the formation of both styles; and it should still more authoritatively determine our choice of either.