This camp at Pancras has the brook running quite through the middle of it: it arises from seven springs on the south side of the hill between Hampstead and Highgate, by Caen wood: there it forms several large ponds, passes by here, by the name of Fleet, washes the west side of the city of London, and gives name to Fleet-street. This brook was formerly called the River of Wells, from the many springs above, which our ancestors called Wells: and it may be thought to have been more considerable in former times, than at present; for now the major part of its water is carried off in pipes, to furnish Kentish-town, Pancras, and Tottenham court: but even now, in great rains, the valley is covered over with water. Go a quarter of a mile higher toward Kentish-town, and you may have a just notion of its appearance at that time, only with this difference, that it is there broader and deeper from the current of so many years. It must further be considered, that the channel of this brook, through so many centuries, and by its being made the public north road from London to Highgate, is very much lowered and widened since Cæsar’s time. It was then no sort of embarrassment to the camp, but an admirable convenience for watering, being contained in narrow banks, not deep: the breadth and depth is made by long tract of time. The ancient road by Copenhagen, wanting repair, induced passengers to take this gravelly valley, become much larger than in Cæsar’s time. The old division runs along that road between Finsbury and Holborn division, going in a strait line from Gray’s-inn lane to Highgate: its antiquity is shown it its name, Madan-lane. Let us pass the brook, and consider the eastern half of the camp; only remarking, that a ditch at present dividing the two pastures, which was the station of the horse, is continued across the brook and road, to that eastern half of the camp, and marks, when properly continued, the two gates on the west and east side of the camp, called _porta quæstoria_ and _porta principalis sinistra_: below it is the other cross road of the camp, called _via Quintana_.