and set apart in 1331 for the completion of the building.  They were raised upon all goods bought or sold within the city in two separate rates, the net produce amounting in the first year to 2,000 lire.[20] The cathedral designed by Arnolfo was of vast dimensions:  it covers 84,802 feet, while that of Cologne covers 81,461 feet; and, says Fergusson, “as far as mere conception of plan goes, there can be little doubt but that the Florentine cathedral far surpasses its German rival."[21] Nothing, indeed, can be imagined more noble than the scheme of this huge edifice.  Studying its ground-plan, and noting how the nave unfolds into a mighty octagon, which in its turn displays three well-proportioned apses, we are induced to think that a sublimer thought has never been expressed in stone.  At this point, however, our admiration receives a check.  In the execution of the parts the builder dwarfed what had been conceived on so magnificent a scale; aiming at colossal simplicity, he failed to secure the multiplicity of subordinated members essential to the total effect of size.  “Like all inexperienced architects, he seems to have thought that greatness of parts would add to the greatness of the whole, and in consequence used only four great arches in the whole length of his nave, giving the central aisle a width of fifty-five feet clear.  The whole width is within ten feet of that of Cologne, and the height about the same; and yet, in appearance, the height is about half, and the breadth less than half, owing to the better proportion of the parts and to the superior appropriateness in the details on the part of the German cathedral."[22] The truth of these remarks will be felt by every one on whom the ponderous vacuity of the interior has weighed.  Other notable defects there are too in this building, proceeding chiefly from the Italian misconception of Gothic style.  The windows are few and narrow, so that little light even at noonday struggles through them; and broad barren spaces of grey walls oppress the eye.  Externally the whole church is panelled with parti-coloured marbles, according to Florentine custom; but this panelling bears no relation to the structure:  it is so much surface decoration possessing value chiefly for the colourist.  Arnolfo died before the dome, as he designed it, could be placed upon the octagon, and nothing is known for certain about the form he meant it to assume.  It seems, however, probable that he intended to adopt something similar to the dome of Chiaravalle, which ends, after a succession of narrowing octagons, in a slender conical pyramid.[23] Subordinate spires would then have been placed at each of the four angles where the nave and transepts intersect; and the whole external effect, for richness and variety, would have outrivalled that of any European building.  It is well known that the erection of the dome was finally entrusted to Brunelleschi in 1420.  Arnolfo’s church now sustains in air an octagonal cupola of