SECTION XXIII. Some of the barbaric nations were, of course, not susceptible of this influence; and when they burst over the Alps, appear, like the Huns, as scourges only, or mix, as the Ostrogoths, with the enervated Italians, and give physical strength to the mass with which they mingle, without materially affecting its intellectual character. But others, both south and north of the empire, had felt its influence, back to the beach of the Indian Ocean on the one hand, and to the ice creeks of the North Sea on the other. On the north and west the influence was of the Latins; on the south and east, of the Greeks. Two nations, pre-eminent above all the rest, represent to us the force of derived mind on either side. As the central power is eclipsed, the orbs of reflected light gather into their fulness; and when sensuality and idolatry had done their work, and the religion of the empire was laid asleep in a glittering sepulchre, the living light rose upon both horizons, and the fierce swords of the Lombard and Arab were shaken over its golden paralysis. SECTION XXIV. The work of the Lombard was to give hardihood and system to the enervated body and enfeebled mind of Christendom; that of the Arab was to punish idolatry, and to proclaim the spirituality of worship. The Lombard covered every church which he built with the sculptured representations of bodily exercises--hunting and war. [Footnote: Appendix 8, "The Northern Energy."] The Arab banished all imagination of creature form from his temples, and proclaimed from their minarets, "There is no god but God." Opposite in their character and mission, alike in their magnificence of energy, they came from the North, and from the South, the glacier torrent and the lava stream: they met and contended over the wreck of the Roman empire; and the very centre of the struggle, the point of pause of both, the dead water of the opposite eddies, charged with embayed fragments of the Roman wreck, is VENICE. The Ducal palace of Venice contains the three elements in exactly equal proportions--the Roman, Lombard, and Arab. It is the central building of the world. SECTION XXV. The reader will now begin to understand something of the importance of the study of the edifices of a city which includes, within the circuit of some seven or eight miles, the field of contest between the three pre-eminent architectures of the world:--each architecture expressing a condition of religion; each an erroneous condition, yet necessary to the correction of the others, and corrected by them.