But before I go further I will dispose of an interesting point which many have thought a defect in the architectural genius of the Greeks. You will see in every book that the use of the arch was unknown to them, and that for this capital feature in our buildings we are wholly indebted to the Romans. That the arch was not in use among the Greeks, I attribute to the fact that the round house and conical roof were deliberately rejected by them in favour of the square house and wooden structure of doorways and roofs. As already observed, this form was long since devoted to funeral purposes and to the burying (not burning) of the dead, and so its associations were gloomy. But it seems to me absurd to say that people who could frame a conical stone roof, by horizontal layers of stones gradually closing inwards, should not have advanced to the principle of the arch with its keystone. This in fact Pausanias assumed them to have done in the Tomb of the Minyæ at Orchomenos. He says the top stone of the vault is the άρμονία of the whole vault. If this was not accurate in the case of Orchomenos, it at least shows that Pausanias, a very experienced observer of old Greek building, did not hold that this generic distinction existed between Greek and Roman building. But, as I said, the Greeks rejected round or conical forms for rectangular, and the Roman combination of the two, which passed on to the Renaissance, is distinctly a modification of form to which the Greeks would not have agreed. Still less would they have approved of the use of arches and of architraves as the mere ornament of a building, and supporting nothing. To the Greeks every member of their building was there for use. A pillar was set to support an architrave, this latter to support the beams of a roof. Flat surfaces were decorated with painting, or with reliefs, but these flat surfaces were necessary to close in the building from the weather. Thus, to illustrate bad building by an example, when you look at the portal of St. Mark’s at Venice, you will see groups of marble pillars with a highly decorated arch over them, making a rich doorway. But there are more pillars than are wanted to support the arch, so that some of them stand idle, as a mere added ornament. That is only one instance of the tawdriness which infects the decadence of a great style--in this case of the Romanesque architecture of eastern Italy and Sicily.