Fig. 20.
To the rear of the southern straight side of the octagon two columns stand under the gallery, with wide fillets worked on both sides of their bases, shafts, and capitals, showing that a frame of stone or wood was once affixed to them. The capitals are of the ordinary cushion type and bear on opposite faces the monograms Justinian, Basileus.
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SS. Sergius and
Bacchus. The Interior, Looking north-east. |
SS. Sergius and
Bacchus. Portion of the Entablature. |
To face page 74.
Two feet above the cornice, or twenty feet from the floor of the church, the level of the gallery is reached.[111] Here the columns are smaller than those below, and are bound together by arches instead of by an architrave. Their capitals represent the type known as the 'Pseudo-Ionic' or cushion capital, in view of its broad head. It appears appropriately here as the form of capital required to carry the impost of an arch upon a capital. At one time, indeed, that demand was met by placing upon the capital a distinct block of stone, a fragment, so to speak, of the horizontal architrave. It is the device adopted in San Vitale at Ravenna, S. Demetrius of Salonica, and elsewhere, but never it would seem in Constantinople, except in the underground cisterns of the city. It was, however, too inartistic to endure, and eventually was superseded by capitals with a broad flattened head on which the wide impost of an arch could rest securely.[112]
A free form of acanthus, deeply undercut on the face towards the central area of the church, covers the capitals, and in the centre of that face, on all the capitals except the eighth (counting from the north-east) is carved the monogram of the title Basileus, or of Justinian, or of Theodora.
In the south side of the gallery stand two columns corresponding to the two columns in the aisle below. They are poor in design and not original. The western capital is 'Pseudo-Ionic,'[113] with a plain cross on the northern face. The eastern capital is in the basket form with roundels on the four faces. Two additional columns are found in the western portion of the gallery. They are of verd antique and larger than the other columns in this story of the church, and have sunk crosses in them. The splendour of the interior decoration has certainly been dimmed, for the walls of the edifice once gleamed with marbles and glittered with mosaics. 'By the sheen of its marbles,' says Procopius,[114] 'it was more resplendent than the sun, and everywhere it was filled profusely with gold.' When Ferguson examined the building, remains of frescoes or of mosaics, which have disappeared since his time, could be distinguished in the narthex. The soffit, both of the upper and of the lower cymatium on the piers, projects sufficiently to admit the application of the customary marble incrustation. The proportions of the building are marred by the boarded floor which rises seventeen centimeters above the original pavement, disguising the real elevation of the dome and of the columns in the lower colonnade. But notwithstanding all changes for the worse the building is still a beautiful structure. Very effective especially is the happy combination of the various lines and forms here brought together—the rectilinear and the semicircular sides of the octagon, the octagonal fabric and the round dome that crowns it, the horizontal entablature stretched along the summit of the lower story of columns and the arches that leap from column to column in the gallery. This harmonious variety of form has also a historical significance. An old order in architecture and a new order here meet and embrace before the earlier, having served its age, passes away and the later comes triumphant to fill another era of the world with fresh beauties. Here in the tide of time we look before and after.
To the student of architecture the dome of this church is specially interesting. In the application of the dome to the octagon no pendentives are employed. The octagon is carried up to the base of the dome, which is built in sixteen longitudinal compartments that impinge upon one another and form groins giving to the dome its strength and sweep. On the groins is a plaster moulding, probably Byzantine. The eight compartments directly above the dome arches are flat, and flush with the inner face of the octagon, and in each of them is a semicircular-headed window. They rise perpendicular to a point a little above the windows, and then curve with a radius to the centre of the dome.