of the modern Mornington House round which the district boundary is still diverted as it was when the abbey, on the Kesteven fen edge, owned it. There were more but still rather few smaller dwellings called cotes. Moors Cote lay in Bourne North Fen, to the south-east of Twenty and Guthram Cote stood on the boundary between Kesteven and Holland, on an island of Devensian deposits, the Abbey sand and gravel. The road book, Paterson's Roads, of 1826, lists a toll gate at Guthram Cote, a distance of from Bourne. Just to the east of this was the bridge over what it calls the South Forty-Foot Eau(15). Pinchbeck The Kesteven-Holland boundary is formed by the South Forty-Foot Drain, the main land drain of the Black Sluice Level. The present layout of the drainage dates from the Act of Parliament of 1765 but this part of the South Forty-foot is a re-use of one of the main drains of the Lindsey Level, a scheme which was declared complete in 1638. On the other side, in Pinchbeck North Fen, the road begins to wind, something quite unusual in these fens. It was laid out on the bank of a soak dike called the Weir Dike, which was cut in about 1600. In Pinchbeck North Fen, the dike is now largely defunct. The instructions stipulated that it should be at a distance of 100 feet (33M) from the bank of the River Glen. As the river bank meandered a little, so the road does(13). The river is the one the A151 crosses at Corby Glen and Edenham. Here the two parts are combined. Beyond the Glen, to the south, is an area of dense Romano-British occupation. On this side, a little is known but if there is more, it is covered with post-Roman marine silt(14). It looks as though this part of the river began as a single sea bank, keeping the tide out of Pinchbeck South Fen but allowing it into the lower part of that area behind the townland to the north of the road. In the late Roman or early post-Roman period, the Glen escaped from its artificial Roman course of which the Bourne Old Ea was part. (The road follows the bank of this while leaving Bourne) and found its way to these tidal flats. Later, at some early but unknown medieval date, the marsh was turned into a