a line passing through them from the centre, which have been found in such numbers on the rocks in the north of England and in Scotland.[356] These are, so far as I know, the only examples of these circles which were buried, and were consequently associated with other objects which assist in fixing their age. [Illustration: 107. Dolmen at Halskov. From a drawing by Madsen.] As before hinted, many of the monuments engraved by Madsen[357] are so extremely like those in the field of Northern Moytura that it is almost impossible to believe that they were erected by a different race of people, or at any great distance of time. The one, for instance, at Halskov is so like the dolmen and circle represented in woodcut No. 61 that the one might almost pass for the other, were it not that the photograph is taken from the wrong side, to bring out the resemblance, as it is seen on the spot, while in others the resemblance is as great, or even greater. It is very unsatisfactory, however, picking these points of similarity from books, some of the engravings in which are from imperfect drawings. In others, artistic effect has been more aimed at than truth, and some are taken from photographs, which, though they give a truthful, generally give an unintelligent representation of the object. It is only by personal familiarity that all the facts can be verified and pitfalls avoided. But it is always useful to turn attention to any forms that may seem novel, and explain peculiarities in others which but for such means of comparison would remain unnoticed. Here, for instance, is one from Sjöborg, which resembles the Countless Stones at Aylesford, as drawn by Dr. Stukeley (woodcut No. 27). It is found at a place called Oroust, in Böhuslan,[358] and stands on a low mound encircled by twenty large stones at its base. The chamber is low, and semicircular in form, and in front of it stands what the Germans call a sentinel stone. No date is given to this monument by Sjöborg, for he was so far indoctrinated in modern theories that he believed all dolmens to be prehistoric, though all the circles and Bauta stones marking battle-fields were to him as essentially historic as any monuments in his country. From its appearance, the dolmen at Oroust may be of the same age as the Countless Stones at Aylesford, and if other monuments in the two countries could be compared with anything like precision, their forms and traditions might mutually throw great light on their real histories. [Illustration: 108. Dolmen at Oroust. From Sjöborg.]