“The figure of these monuments,” he says, “is either simple, or compounded. Of the first kind are exact circles; elliptical or semicircular. The construction of these is not always the same, some having their circumference marked with large separate stones only; others having ridges of small stones intermixed, and sometimes walls and seats, serving to render the inclosure more complete. Other circular monuments have their figure more complex and varied, consisting, not only of a circle, but of some other distinguishing properties. In or near the centre of some stands a stone taller than the rest, as at Boscawen-ûn; in the middle of others, a kist-vaen. A cromlêh distinguishes the centre of some circles, and one remarkable rock that of others; some have only one line of stones in their circumference, and some have two; some circles are adjacent, some contiguous, and some include, and some intersect each other. Sometimes urns are found in or near them. Some are curiously erected on geometrical plans, the chief entrance facing the cardinal points of the heavens; some have avenues leading to them, placed exactly north and south, with detached stones, sometimes in straight lines to the east and west, sometimes triangular. These monuments are found in many foreign countries, in Iceland, Sweden, Denmark, and Germany, as well as in all the isles dependent upon Britain (the Orkneys, Western Isles, Jersey, Ireland, and the Isle of Man), and in most parts of Britain itself.”