The cross-section of the wall, Plate X., gives its dimensions at a point near the bridge, where its height is greatest. Below this cross-section another of the Edwah-Biahmu bank is given for a comparison of the levels of wall and bank.[3] _Erroneous Data employed by Linant._—In Linant Pasha’s Atlas, published with his Mémoires, is to be found an extraordinary section of the Fayûm from Lahûn to Birket-el-Qurûn, in which the land from Lahûn to Medineh is shown as being higher than the land of Beni Suef on the Nile Valley side of Lahûn. I reproduce his section on Plate XI., and below it I give a section showing the actual levels. As Linant appears to refer all his levels to the rock bed at Hawârat-el-Maqta, which he makes 32·80 metres above sea, whereas it is really 21·00, it is necessary before comparison to apply a correction of - 11·80 to all his levels. [Illustration: PLATE X. CROSS SECTION OF THE MINIA WALL.] [Illustration: CROSS SECTION OF THE EDWAH-BIAHMU BANK AT A POINT WEST OF EDWAH.] Comparing the figures after correction with those of the “actual section,” it will be found that Linant puts the level of the Beni Suef lands 5½ to 7 metres too low, and that of his first plateau 6 to 8 metres too high, with reference to the rock bed at Hawârat-el-Maqta. According to the corrected figures his Lake Mœris level would be + 32·00, but how he gets it to that level it is difficult to understand, inasmuch as he says that his lake is filled by the Bahr Yûsuf, whose high-water level is shown 4½ metres lower. (The Birket-el-Qurûn level, after applying the correction, becomes 40·80, which must have been about its correct level in Linant’s time.) [Illustration: PLATE XI. SECTION OF THE FAYÛM THROUGH LAHÛN-MEDINEH-SANHUR. By M. LINANT.] [Illustration: ACTUAL SECTION ON THE SAME LINE. _Note._—The water-level of the Bahr Yûsuf from Lahûn to Medineh is a little below country level throughout.] I give another instance of error with reference to Linant’s conception of the first plateau. Writing of the bank from Edwah to el Alam, he states that the land to the south of this bank was about 2 metres below its crest, and to the north of it from 8 to 9 metres, which difference, he says, is explained by the deposition of silt in the interior of the basin formed by the bank, as is always seen elsewhere at all the banks of the inundation basins of Egypt. This great difference of level of the country surface on either side of the bank would have been very suggestive in a sense favourable to M. Linant’s theory had the difference of level been a fact instead of a fiction. The cross-section of the bank given on Plate X. shows its actual state with reference to the land on each side of it.