The construction and general arrangement of a Greek theatre differed widely from any form of theatre to be found at the present day. The Greek theatre was exposed to the open air, and had no roof or covering of any kind. It was generally built upon the slope of a hill in or near the city. It was of enormous magnitude, compared with a modern theatre, being intended to contain at one and the same time the whole theatre-going population of the city. The largest part of it consisted of the auditorium, or tiers of seats for the spectators. These seats rose one above the other like a flight of steps, and were arranged in the form of a semicircle with the two ends prolonged. The flat space at the bottom of the auditorium, corresponding to the stalls and pit in a modern theatre, was called the orchestra or ‘dancing-place’, and was used by the chorus only, the spectators being entirely excluded from it. At the further end of the orchestra, facing the tiers of seats, rose the stage and the stage-buildings. The stage was a long platform, much narrower than a modern stage, and was reserved for the actors, as opposed to the chorus. The open-air building, the performance in broad daylight, the vast crowds of spectators, the chorus grouped together in the centre, the actors standing on the narrow stage behind them—all these characteristics of a Greek theatrical exhibition must have combined to produce a scene to which there is no exact parallel at the present day. This fact should be kept clearly in view, in discussing all questions connected with the Greek stage. Many errors have been caused, and many unnecessary difficulties have been raised, owing to the failure to realize the essential difference between the external features of the ancient and the modern drama. § 2. _The old Wooden Theatres at Athens._