Develin Tower, in 4 Richard II. “Galighmaies Tower,” when no cart or dray was to come before it into St. Katherine’s unless the brethren paid a fine to the constable, was, in 1549, Galleyman, and in 1641, Iron Gate Tower. Until recently it was a powder-magazine, and not to be entered with a light. These conditions are not favourable to the study of its interior. It is a long rectangular tower, 18 feet by 32 feet, and built wholly in the ditch, one end being applied to the face of the curtain, so that it projects like a buttress from the south end of the east curtain, while its south side is a prolongation of the river front. The exterior has been partially cased, but it is evidently old, and in substance as originally built. Its basement is solid, but about 10 feet above the ditch is a line of loops on the north and south, or two longer faces. There has been an upper story, the walls of which remain, but seem later than the lower. At this level, in the east face, is the outline of a door, which, if a postern, opened 20 feet above the ditch. The view of 1597 shows a double wall, probably an embattled dam serving as a bridge, extending from this tower across the ditch, and crowned on the counterscarp by a small work, called the “Iron Gate.” If this drawing be correct, the roadway was through the basement chamber, and the upper floor led to the rampart of the wall. This gate led into the precinct of St. Katherine’s. The tower is probably the work of Henry III., and connected with an original dam for keeping up the water of the ditch. Forty feet west of Develin is Well Tower. [Illustration: WELL TOWER.]