To go into the various classes of secular buildings, and to show the consistency of their treatment, each with its own proper requirements, would fill a volume, and a volume, if it did any justice to the subject, well worth reading. I must not now go farther. I will, however, point out a few developments demanding our notice. I have before alluded to several points of difference between the windows of secular and ecclesiastical buildings. These differences were carried farther and farther according to the demands of the particular building in hand. The windows were wide or narrow, more or less numerous, subdivided or undivided, arched or square-headed, and, if arched, had high or low arches, strictly according to the demands of the rooms within; and whatever those demands were, the architecture was subordinated to them. Some buildings had windows few and far between; others were nearly all window; and of course there were all intermediate varieties. Some buildings were vaulted in every storey, giving good examples of really fireproof construction; others were fireproof through one or two storeys, and timbered above; and others, again, had timber floors throughout. In secular structures we find trabeated architecture in its truest form--not stone beams, which, when extended beyond very narrow limits, go against the nature of the material, but real beams of wood, used in a thoroughly sensible and constructive manner. I would particularly call attention to the fact that beams were not merely run into walls--where, the moment the ends so immured decay, down comes the floor; but they were aided by stone corbels, and not only so, but by timber corbels, lying on them; or if the bearings were very great, braces were added, which will carry the beams even when the ends are rotted off. This is trabeated architecture in a very genuine form. I dare say both Greeks and Romans may have used it so, too; but as their timbers have gone to dust, the Renaissance has lost its precedents, and has too often imitated stone construction in wood, or in more modern works, in lath and plaster; for wood, having disappeared from among the precedents, has of late been to a great extent eschewed as a visible architectural material. Then, again, we have another common-sense development--the fireplace. The Romans had a number of good methods of warming their buildings; but the straightforward, honest fireplace--the social palladium of the Englishman--we owe, I believe, to the Mediæval builders--the men who are said to have known nothing of modern comforts. There are fireplaces in old Norman castles--Conisborough, for instance--as good as in a Belgravian house, and the chimney-pieces were often a great deal handsomer. With the fireplace came that other modern feature, the chimney-shaft. Look how consistently with common sense, and with the principle of decorating what was demanded by utility, that was treated!