came a gangway for those who wished to move to or from their places, who could thus pass along without incommoding those who were seated; and the third surface was that on which the next row below were seated. There were, as a rule, no backs to the seats, but in places where there was a wider gangway, and thus one row of spectators did not come into immediate contact with the next, they were sometimes introduced and made of one piece with the seat. In larger theatres the auditorium was almost always divided into several storeys by gangways. These gangways ran round the auditorium concentrically with the seats, and their object was to facilitate the circulation of the public; they were therefore of considerable breadth (compare Fig. 153), and sometimes two such gangways were put close to each other, one higher and one lower, so that the public could circulate easily on them without pushing each other. The separate seats were everywhere connected by steps. Although the arrangement of the whole auditorium with its raised seats was that of a circus, yet the seats were far too high to be used as steps also, and these had to be specially constructed. They were of two kinds; small steps in the direction of the seats, the object of which was to enable people to mount from one seat to the next, and the principal staircases, which intersected the seats through their whole extent from top to bottom, and formed, as it were, radii of the circle represented by the auditorium. The number of these staircases was larger or smaller as occasion required; sometimes the number was doubled at the top, where the distances increased, by introducing a third staircase between each pair; sometimes the staircases which began below did not continue at the top, but there was a change in the radii. It was most common, however, for these staircases to intersect the whole theatre right up to the highest seats, and thus to divide the whole auditorium into a number of wedge-shaped divisions, which, in fact, received the designation of wedges (κερκίδες). Sometimes these wedges had special names, being called after statues which were placed there, as, for instance, in the theatre at Syracuse, and these designations facilitated the finding of places. As a rule, the steps were so arranged that there were two to every seat, thus each step was half the height of the seat.