On the map of Linant Pasha’s, published in 1854, before the railway and Ibrahimîyah Canal were made, the channels in the Nile Valley shown in connection with the Lahûn entrance are the Bahr Yûsuf, coming from the south, and the Magnûnah Canal going north. The latter, after going north for 13 kilometres, is joined by three channels, the first taking off from the Nile at Beni Suef, and the second and third a little south of Ashment. The third is the old Magnûnah. These channels unite in the neighbourhood of Abûsir-el-Malaq, the second passing by the village of Bûsh, the immense heap, on which the modern village stands, witnessing to the existence of an ancient town on that spot. Abûsir-el-Malaq also was evidently in the far past a place of importance. North of Abûsir-el-Malaq the channel of the Magnûnah is continued as a single channel along the west desert for 4 or 5 kilometres when it bifurcates, one branch continuing under the western desert, and the second going east to join the Nile at the point where Kosheshah Escape now stands. Some of these channels are shown on Plate XXI. Having evidence of no other channels, let us suppose that the Magnûnah Canal with its mouth near Ashment was the feeder, the branch to Kosheshah Escape the exit channel, and the eastern branch under the western desert a canal of supply to Memphis. (The Bahr Yûsuf I do not consider as in those times a channel in _direct_ communication with the Nile.) With R.L. 22·50 and 19·50 as the maximum and minimum levels of Lake Mœris, there would, under these circumstances and unless prevented by the use of a regulator, have been a flow into the lake from about the 15th July to the 15th January, and a return flow from the 15th January to the 15th July. The levels of the Nile and lake would have been approximately as follows:— R.L. { Lake 19·50 Lowest water levels, { when lake ceases to { Junction at Abûsir-el-Malaq 19·40 flow out and the { flow-in is about to { Magnûnah Nile mouth at Ashment 20·00 commence. { { Outlet into Nile at Kosheshah Escape 19·00 { Lake 22·50 Water levels on 15th { January, when flow-in { Abûsir-el-Malaq 22·00 would cease and lake { return-flow would { Magnûnah mouth 23·00 commence. { { Outlet, Kosheshah 21·00