Standing on Silbury Hill and looking westward, the road coming from Bath over the downs seems to come direct at the hill. After passing the Devizes road, it trends to the southward, and shortly again resumes its original direction. About a mile before it reaches the hill, it again resumes its southward direction, and passes it at a distance of between 50 to 100 yards, making, apparently, for the spot where the bridge over the Kennet now exists, and may have existed in Roman times. Those who contend for the pre-Roman antiquity of the hill rest their case on the assumption that the Romans always made or wished to make their roads perfectly straight, and that this being deflected to the south, it was in consequence of the hill being there at the time the road was made. This, however, is singularly contradicted by the line of this very road westwards from the Devizes road. According to the Ordnance Survey, it is set out in a curve for 3½ miles till it meets the Wandsdyke. Why this was done is not clearer than why the road should have been curved to the eastward of the Devizes road. But, on the other hand, supposing the hill to have been where it now stands, and the Romans wished the road to be straight, nothing in the world was so easy as for them to set out a line mathematically straight between the Devizes road and the point where it passes the hill. The country is and was perfectly open, and quite as flat as any Roman road-maker could desire, and signals could have been seen throughout with perfect facility. It is crediting the Roman surveyors with a degree of stupidity they certainly did not show elsewhere, to say, if they wanted a straight road, that seeing the hill before their eyes, they first set out their road towards it, when they knew that before they had advanced a mile, they must bend it so as to avoid that very obstacle. Even then they would have tried to make it as straight as possible, and would have adopted the line of the present coach-road, which runs inside their line and between it and the hill. At the same time, if any one will turn to Sir R. Colt Hoare's map of the Roman roads in this district--"Stations Calne and Swindon"--which includes Avebury, he will find that all are set out in lines more or less curvilinear, and sometimes violently so, when any object was to be gained by so doing. Though, therefore, as a general rule, it is safe to argue on the presumption of the straightness of Roman roads, it may lead to serious error to rely on such evidence in every instance.