The history of the stage-buildings during the next two hundred years or so is a blank. Nothing can be ascertained on this subject from the ruins. The first great alteration of which traces remain was carried out in the course of the first or second century B.C. according to Dörpfeld, the fourth century according to Puchstein. A permanent stone proscenium was then erected in the space between the wings. It is marked _o_ in the plan. The front of this proscenium consisted of a row of columns supporting an entablature. Its height, as may be calculated from the traces of the columns, was about 13 feet; its depth between 9 and 10 feet. It was covered on the top with a wooden platform, resting on beams, the holes for which are still visible in fragments of the architrave. In the centre of the front part of the proscenium was a door leading out into the orchestra. This door varied in width at different periods from 4½ to 5½ feet, but there is nothing to show which was the earlier and which the later of the two widths. Traces of a smaller door, to the west of the central one, have also been discovered; but there are no traces of a door to the east. As this new stage was only about ten feet deep, smaller side-wings were required. The old wings of the earlier theatre were therefore thrown back about 5½ feet, thus adding several feet to the width of the ‘parodoi’. Beyond the construction of the stone proscenium no further remains of new erections belonging to this reconstruction have been discovered; but it is probable that the upper part of the building was considerably altered at the same time.