But it was on the Continent, especially in France, the Low Countries, and Germany, that the Gothic flower opened in fullest perfection; and it is here that we find the loftiest and most luxurious spire-forms. They were always the last part of the church completed, the finishing-touch, the last that was needed to perfection. The progress of the building of a cathedral thus embodied a beautiful symbolism. In most cases, the choir, or east end, the holiest part of the church, was the first erected, in order to sanctify and protect the high altar; and then, as the treasures of the church flowed in, after the expiration of years or centuries, the builders, tutored by a legendary science, and harmonized by a wonderful feeling of brotherhood, in the same spirit, perfected the designs of their predecessors, by leading out westward the long naves and attendant aisles, completing northward and southward the transepts, adding a chapel here and a porch there, glorifying the western front with the touches of divine genius; and when at last every niche was occupied with its statue of angel, saint, or pious benefactor, and the holy choir, with its apsis, had been re-adorned with the accumulated art of centuries, and glowed with the iris-light from painted windows,--when the mural monuments of bishops, warriors, and kings had thickened beneath the consecrated roof, and the whole structure had been hallowed by the prayers and chantings of generations,--then, at last, over the ancient tower arose the lofty spire; as if an angelic messenger had spread his wings at its base and mounted upward to heaven, shouting out the glad tidings of the completion of the House of God, and, as he arose, the voice grew fainter and fainter, till at length it melted into the sky! The finest spires of Europe were erected as late as the fourteenth, fifteenth, and sixteenth centuries, upon towers prepared for their reception, usually, in much earlier times. This confidence of the old builders in the final completion of their structures is remarkable. They drew without stint on the piety of after ages,--a resource which has not unfrequently proved too feeble to realize their generous expectations. There are few cities in Europe which do not bear sad marks of this misplaced confidence. This is especially witnessed in the unfinished steeples. And, indeed, when we find that not only one, but two, three, four, or even five spires were sometimes required to flame upward from the same building, as in Caen Cathedral, we do not wonder that the kindling spark is often wanting. It would seem as if another fire must come down from heaven, as of old it did upon the first offering of Moses and Aaron, to inflame these censers, rich in frankincense and naphtha.