One immediate result of the draining and embanking of the Fens would be the more complete occupation of the forest or heath district of Kesteven. That district was intersected by two branches of Ermine Street, which both start from Castor, and may have united at Lincoln. The eastern branch, which enters the county at West Deeping and runs along the high land parallel to the Cardyke for over twenty miles, is the shorter in actual distance; but it was not the main route, and the branch-ways from it across the Fen indicate that it was the later in date. South of Bourn, where was a camp close to the Cardyke, it is known in parts as Langdyke, High Street, and King Street; between Bourn and Sleaford it is generally called Mareham Lane. There was a by-way from it at Morton, which has been traced to the western branch at Great Ponton; and at Threckingham it is crossed from the east by the Saltway just mentioned. On each side of the latter way, about four miles west of Threckingham, tessellated pavements have been found at Haceby and Aisby; and after crossing the western branch at Cold Harbour,[24] near Grantham, the Saltway passes south-west into Leicestershire. At a ford near Sleaford, where coins and much pottery indicate that there was some kind of station, the eastern branch is within six miles of the western at Ancaster; and there was doubtless a cross-road between them, as interments have been found at Rauceby and coins at Bully Wells. Ancaster, on the western branch of the Ermine Street, is one of those sites which, from a military camp on a main southern route, rose to be a small town, with a population probably engaged in agriculture. It is now generally identified with Causennæ, the station next to Lincoln in the fifth Iter of the _Itinerary_; but its distance from the colony is only fourteen miles instead of the twenty-six there given. No traces of walls are now visible above-ground, and even Leland, nearly four hundred years ago, spoke doubtfully as to their existence; but since his time their foundations have been met with on the north and west sides. The boundaries of the station, which was nearly square, and was surrounded by a fosse 50 feet wide and 10 feet deep, can still be distinctly seen; and it was defended at the corners by circular towers, the outlines of which on the north-west and south-east are well defined. The area enclosed is about six acres; and the course of Ermine Street, which intersects it, is near the western boundary. This suggests that the town was extended, before the erection of its walls, up the slope towards the east. Its position, on much lower ground than the heights around, was probably chosen partly to provide shelter from the bleak winds of the heath, partly for the sake of two springs which are close to its northern and southern limits. From a description of the place in 1579, it appears that pavements and “arches” had then been discovered within it; but a large