XVII. 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. XVIII. It does not belong to my present plan to consider at length the second head of duty of which I have above spoken; the preservation of the architecture we possess: but a few words may be forgiven, as especially necessary in modern times. Neither by the public, nor by those who have the care of public monuments, is the true meaning of the word _restoration_ understood. It means the most total destruction which a building can suffer: a destruction out of which no remnants can be gathered; a destruction accompanied with false description of the thing destroyed. Do not let us deceive ourselves in this important matter; it is _impossible_, as impossible as to raise the dead, to restore anything that has ever been great or beautiful in architecture. That which I have above insisted upon as the life of the whole, that spirit which is given only by the hand and eye of the workman, never can be recalled. Another spirit may be given by another time, and it is then a new building; but the spirit of the dead workman cannot be summoned up, and commanded to direct other hands, and other thoughts. And as for direct and simple copying, it is palpably impossible. What copying can there be of surfaces that have been worn half an inch down? The whole finish of the work was in the half inch that is gone; if you attempt to restore that finish, you do it conjecturally; if you copy what is left, granting fidelity to be possible (and what care, or watchfulness, or cost can secure it?), how is the new work better than the old? There was yet in the old _some_ life, some mysterious suggestion of what it had been, and of what it had lost; some sweetness in the gentle lines which rain and sun had wrought. There can be none in the brute hardness of the new carving. Look at the animals which I have given in Plate 14, as an