The foundations discovered on the site of Leadenhall Market represented some very large and exceptional structures. The following account is condensed from Mr. Lambert’s description in _Archæologia_: “The plans show at the eastern end a quarter-circle of 27 ft. 7 in. radius, which seems to represent the eastern apse mentioned by Brock; and in continuation of its southern line, a wall about 150 ft. long, having the extraordinary breadth of 12 ft. 7 in., runs to the line of and apparently underneath Gracechurch Street.... From the south side at the east end, spring at right angles three walls, which doubtless enclosed the ‘two chambers like transepts’ mentioned by Brock.... It is probable that work of different periods is included in this plan.... The northern half of the great wall appears to be brick, the rest stone or rubble, as though one wall had been built along the face of another.... It is clear from the drawings that the bulk of the eastern portions of the remains is homogeneous in structure. The extra thickness of the great wall and the fragments of solid brick walls at either end of the site represent perhaps later additions.... These remains form the most extensive fragment of a Roman building recorded within the Walls of London.” From the thick mortar joints of the brick walls, Mr. Lambert concludes that they were probably built in the third or fourth century. The more or less alternating use of red and buff bricks, as I have already suggested, is also evidence that this part of the work should be assigned to the fourth century. Concrete, tessellated and herring-bone floors were found, also flue tiles (Price, _Athen._, 1881). Some of the bricks used were of larger size than the ordinary, being 20 in. by 12½ in., and the drawings show that they were carefully laid with alternate headers and stretchers (Fig. 17). They were 1¾ in. thick, and four courses made 10-12 in.; the joints were thus about 1¼ in. thick. At the Guildhall is a fragment of brickwork from Leadenhall Market, with bricks and joints both 1½ in. thick. The stone walling was of concreted rubble, with facings on each side in small, roughly wrought but carefully-coursed stones; the layers of bonding tiles passed through the thickness of these walls (Fig. 20). A large drain ran parallel to the outer south wall about 4 ft. wide, including its brick sides. The general plan shows a total length from the apse at the east to the broken wall at the west against Gracechurch Street of about 210 ft. About 44 ft. to the north of the Great Wall a parallel wall is shown on the plan, but no details are given, and it may not have been Roman.