I imagine the terrace at top in our work was designed for the men of arms: for they are by no means to be excluded, seeing one of the primary intents of these diversions was to inure them, as well as the people, to blood and murder. Hence, before they went upon any great expedition, or foreign war, these feasts and butcheries were publicly celebrated: and in my opinion, the two rising plots, that are squarish on each side upon the shortest diameter, were for the officers. These are above the level of the walk, or terrace, and might possibly have a tent set upon them for that purpose. I call them pavilions: they are of a handsome turn, and capable each of holding two dozen of people commodiously: their side-breadth is fifteen foot; their length, i. e. north and south, twenty: they are somewhat nearer the upper end, not standing precisely upon the shortest diameter, and four foot above the level of the terrace. I considered with care that seeming irregularity of the terrace on both sides the lower end; for it is higher within side than without, yet so as to produce no ill effect below, either within or without, but the contrary. I find it is a master-piece of skill, and am surprised that it has not been more defaced in so long time. The matter is this: the work standing on a declining plain, this artifice was necessary to render its appearance regular; for when you stand in the centre within-side, the whole circuit of the terrace seems and is really of one level: but on the out-side the verge of the north-easterly part is sloped off gradually toward the entrance where the declivity is, conformably with it; whence the whole exterior contour appears of an equal height too: and this could not otherwise have been obtained, since within it was necessary to keep a true level, without regard to the outer plain. As to the seats, which I have supposed in plate 50, they were contrived to be twice as broad as high: their height was but a small matter more than a foot, and their breadth not above two feet and a half; half that space being allotted for the seat of the lowermost, and the other half for the feet of the uppermost. The declivity of these _gradus_ is justly made within an angle of thirty degrees, the third part of a quadrant: but this is more exact at the ends; for in the middle, or towards the shortest diameter over the elevated part of the circular walk, the upper _series_ of seats has a somewhat more obtuse angle; the reason of which is obvious, to overlook the breadth of the circular walk. This is most plainly seen in the sections, and is done with judgement, because by that means the upper edge of the amphitheatre is in a right line with the declivity. As to the disposition of these seats, their method is as new as curious: it is so contrived, that the circular walks cut the whole breadth in two equal parts upon the shortest diameter; therefore an equal number of seats is above and under it: hence the middle seat