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62 the same principle. It has the enclosing vallum, with its ditch inside, like Arborlow, Marden, Arthur's round table, at Penrith, and others we shall meet with further on, while its circle and avenues are identical, as far as we can judge, with numerous examples found elsewhere.

Before, however, proceeding to reason about Avebury, the first point is to ascertain what the group really consists of, which is a much more difficult task than would at first sight appear. Stukeley has introduced so many of his own fancies into his description of the place, and they have been so implicitly followed by all who have since written on the subject, that it is now no easy task to get back to the original form.

The principal monument at Avebury consists of a vallum of earth nearly, but not quite, circular in form, with an average diameter of about 1200 feet. Close on the edge of its internal ditch stood a circle apparently originally consisting of about 100 stones, with a distance consequently of about 33 feet from centre to centre. Inside this were two other double circles, placed not in the axis of the great one, but on its north-eastern side. The more northern one was apparently 350 feet in diameter, the other 325 feet. In the centre of the northern one stood what is here called a cove, apparently consisting of three upright stones supporting a capstone—a dolmen, in fact, such as we shall