Nearly midway in the platform between its northern and its southern edges, and not very far from the boundary of rocky mountain on which the platform abuts towards the east, is the vast edifice which has been called with good reason the “Hall of a Hundred Columns,” since its roof was in all probability supported by that number of pillars.  This building consisted of a single magnificent chamber, with a portico, and probably guard-rooms, in front, of dimensions quite unequalled upon the platform.  The portico was 183 feet long by 52 feet deep, and was sustained by sixteen pillars, about 33 feet high, arranged in two rows of eight.  The great chamber behind was a square of 227 feet, and had therefore an area of about 51,000 feet.  Over this vast space were distributed, at equal distances from one another, one hundred columns, each 35 feet high, arranged in ten rows of ten each, every pillar thus standing at a distance of nearly 20 feet from any other.  The four walls which enclosed this great hall had a uniform thickness of 10 1/2 feet, and were each pierced at equal intervals by two doorways, the doorways being thus exactly opposite to one another, and each looking down an avenue of columns.  In the spaces of wall on either side of the doorways, eastward, westward, and southward, were three niches, all square-topped, and bearing the ornamentation which is universal in the case of all niches, windows, and doorways in the Persepolitan ruins. [PLATE XLVII., Fig. 2.] In the northern, or front, wall, the niches were replaced by windows looking upon the portico, excepting towards the angles of the building, where niches were retained, owing to a peculiarity in the plan of the edifice which has now to be noticed.  The portico, instead of being, as in every other Persian instance, of the same width with the building which it fronted, was 44 feet narrower, its antce projecting from the front wall, not at either extremity, but at the distance of 11 feet from the corner.  While the porch was thus contracted, so that the pillars had to be eight in each row instead of ten, space was left on either side for a narrow guard-room opening on to the porch, indications of which are seen in the doorways placed at right angles to the front wall, which are ornamented with the usual figures of soldiers armed with spear and shield.  It has been suggested that the hall was, like the smaller pillared chambers upon the platform, originally surrounded on three sides by a number of lesser apartments; and this is certainly possible:  but no trace remains of any such buildings.  The ornamentation which exists seems to show that the building was altogether of a public character.  Instead of exhibiting attendants bringing articles for the toilet or the banquet, it shows on its doors the monarch, either engaged in the art of destroying symbolical monsters, or seated on his throne under a canopy, with the tiara on his head, and the golden sceptre in his right hand.  The throne representations