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Rh certain that they were all connected by a continuous stone impost or architrave, though only six of these are now in situ. The diameter of the circle is generally stated to be about 100 feet, and as this has been suggested as a reason for its being considered as post-Roman, it is important to know what its exact dimensions are. It turns out that from the face of one pier to that of the opposite one, where both are perpendicular, the distance is 97⋅6, or exactly 100 Roman feet. The distance from the outer face of these piers to inside of the earthen vallum that surrounds the whole is again 100 feet, though that cannot now be ascertained within a foot or two, or even more; but as this makes up the 100 yards and the 100 feet which recur so often in these monuments, these dimensions can hardly be considered accidental, and "valeant quantum" are an indication of their post-Roman date.

Inside these outer circles stand the five great trilithons. Since the publication of Sir R. Colt Hoare's plan, their position and plan may be considered as settled. According to him, the height of the outer pair is 16⋅3, of the intermediate pair 17⋅2, and of the great central trilithon as it now stands 21⋅6. In their simple grandeur they are perhaps the most effective example of megalithic art that ever was executed by man. The Egyptians and Romans raised larger stones, but they destroyed their grandeur by ornament, or by their accompaniments; but these simple square masses on Salisbury plain are still unrivalled for magnificence in their own peculiar style.