For their effect they depend wholly on their mass, and that is so great as to produce an impression of power and grandeur which few of the more elaborate works of men's hands can rival. [Illustration: 15. Plan of Avebury Circle and Kennet Avenue, from Sir R. Colt Hoare.] From the outer vallum a stone avenue extended in a perfectly straight line for about 1430 yards, in a south-easterly direction. The centre was apparently drawn from the centre of the great 1200 feet circle, not from those of the smaller ones. This is called the Kennet Avenue, from its pointing towards the village of that name. I am extremely sceptical with regard to the existence of another, called the Beckhampton Avenue, on which Dr. Stukeley lays so much stress. Aubrey did not see it, though he saw the Long Stone Cove, the "Devil's Quoits," as he called them; and Stukeley is obliged to admit that in his day not one stone was standing.[78] It seems that here, as, indeed, everywhere over this country, a number of Sarsen stones were lying about, and his fertile imagination manufactured them into the body of a snake. None, however, are shown in Sir R. Colt Hoare's survey, and none exist now; and beyond the Cove even Stukeley admits that he drew the serpent's tail only because a serpent must have a termination of that sort. There were no stones to mark its form any more then than now. The first objection that appears against admitting the existence of the very hypothetical avenue is, that no curved avenue of any sort is known to exist anywhere, or attached to any monuments. All the curves of the Kennet avenue are the Doctor's own, introduced by him to connect the straight-lined avenues which were drawn from the circle at Avebury, and that on Hakpen Hill. There are none at Stanton Drew, or other places where he audaciously drew them. Near the church there are, or were, two stones placed in the opening like that called the Friar's Heel, and the prostrate stone at Stonehenge, but these are all that probably ever existed of the Beckhampton Avenue. The question is not, however, important. As there were two circles inside the Avebury vallum, there may have been two avenues. All that is here contended for is, that there is no proof of the existence of the second. A dolmen, called the Long Stone Cove, existed near where Stukeley draws its sinuous line, but there is nothing to show that it ever formed any part of such an alignment; and around it there were some standing stones, or rather, even in Stukeley's time, stones which apparently had stood, but there is nothing to show whether forming part of a circle, or as detached menhirs, or as parts of an avenue.