Passing to the inside of the Erectheum, we find all the pavement of the cell removed. The walls for the most part are formed of single blocks, occupying its whole thickness; cramped together, both horizontally and vertically, but the sort of dado-course which you may observe above the base, in the flank elevation given by Stuart, is, or was, in two thicknesses set on edge. The inner slabs have been taken away, so that it is wonderful the wall stands. The parts intended to be exposed both inside and outside, are of Pentelic marble, but those which were entirely hid are of Magnesian limestone, and this peculiarity enables us to determine that the pavement of the cell was lower than that of the portico, for not only the course, which rising above the pavement as high as the top of the base moulding, might be expected to be so, is of marble; but there is another course of marble below it, and again, as you approach the cross wall, marked (a) on Stuart’s plan, there is a third course of marble under the dado. This cross wall does not rise to the height of the outside pavement, and there are no traces of its junction with the side walls above, while on the contrary, though the cross wall (b) is entirely destroyed, and the lower parts of the side walls where this would have joined, are smooth and even up to the height of four courses above what I have called the dado-course, yet above that, the interrupted surface shows the insertion of the bond-stones, and attests the existence of such a wall. It is probable that the lower part was open, and perhaps there were pilasters of metal, and six columns, either of metal or marble in the opening. This back part is so filled up with rubbish, that I could only determine one course lower than those in the first cell, to be of marble. In the north wall there is a row of small holes, very neatly bored; there are several such ranges both here, and in the Propylæa, but I do not know their use.