In painted decorations on walls, etc., much greater liberty may be allowed. We have not here the _material_ limiting the class of art made use of, and the treatment may therefore suit itself freely to the conditions suggested--first, by the purpose of the building; secondly, by its scale of decorative character and the limits of cost; and thirdly, by the more or less _functional_ nature of the surface occupied. We may, in fact, vary from outline pure and simple to perfectly finished paintings, and from a severe and solemn treatment to any reasonable degree of lightness and freedom, according to the conditions: ever remembering that the more functional the surface, the less must be the apparent relief. A painting in a panel may have any amount of shadow and distance, while that occupying a wall, a pier, or a vault must be kept sufficiently flat as to avoid disturbing the functional character of the object which is the ground of the painting. A great deal has been said about _development_ in architecture, and a good deal of harm has resulted from it: not that development is to be objected to--far from it; but because true and genuine development will never be the result of direct and deliberate effort. The true developments we have to look for are such as will be continually forced upon us by the necessities of new materials, new modes of construction, new requirements, and the altered habits and feelings of the age in which we are living; by the different modes of decoration which will from time to time offer themselves to our notice, and the importing into English architecture arts which had previously been peculiar to that of other countries and perhaps to wholly different styles. The conditions also prescribed by works in different climates--as in India, in North America, or in Australia--demand special development. The frank and natural meeting of these new demands and new facilities will of itself produce developments enough to distinguish the works of our revival from those of old times, without our affecting to alter those elements of our style which are not naturally affected by any such conditions. I have said so much, however, on these subjects elsewhere, that I will not venture to crowd their multitudinous details into this lecture: only suggesting, in passing, that _domestic_ architecture by its absolute demands _must_ of necessity suggest very many new developments; that another wide field for novelty of treatment is offered by the _wrought iron_ construction and _fire-proof_ construction of our day; and that there still remains to us the solution of the noble problem of the introduction and naturalisation of the _dome_ as a feature of our revived style. I will now say a very few words on another branch of the practice of a Gothic architect: that which relates to the _repairs_ and _restoration_ of ancient buildings.