vely. In the centre of the northern
pair was a cover-slab supported by three uprights, and in the centre of
the southern a single menhir. All the stones used are sarsens, such as
are strewn everywhere over the district.

An avenue flanked by two rows of stones ran in a south-easterly
direction from the rampart towards the village of Kennet for a distance
of about 1430 yards in a straight line.

At a distance of 1200 yards due south from Avebury Circle stands the
famous artificial mound called Silbury Hill. It is 552 feet in diameter,
130 in height, and has a flat top 102 feet across. A pit was driven down
into its centre in 1777, and in 1849 a trench was cut into it from the
south side to the centre, but neither gave any result. It is quite
possible that there are burials in the mound, whether in megalithic
chambers or not.

South-west of Avebury is Hakpen Hill, where there once stood two
concentric ellipses of stones. A straight avenue is said to have run
from these in a north-westerly direction. Whether these three monuments
near Avebury have any connection with one another and, if so, what this
connection is, is unknown.

There are many other circles in England, but we have only space to
mention briefly some of the more important. At Rollright, in
Oxfordshire, there is a circle 100 feet in diameter with a tall menhir
50 yards to the north-east. Derbyshire possesses a famous monument, that
of Arbor Low, where a circle is surrounded by a rampart and ditch, while
that of Stanton Drew in Somerset consists of a great circle A and two
smaller circles B and C. The line joining the centres of B and A passes
through a menhir called Hauptville's Quoit away to the north-east, while
that which joins the centres of C and A cuts a group of three menhirs
called The Cove, lying to the south-west.

In Cumberland there are several circles. One of these, 330 feet in
diameter with an outstanding menhir, is known as "Long Meg and her
Daughters." Another, the Mayborough Circle, is of much the same size,
but consists of a tall monolith in the centre of a rampart formed
entirely of rather small water-worn stones. A similar circle not far
from this is known as King Arthur's Round Table; here, however, there is
no monolith. Near Keswick there is a finely preserved circle, and at
Shap there seems to have existed a large circle with an avenue of stones
running for over a mile to the north.

Cornwall possesses a number of fine monuments