latter figure represents in one year 26 cubic kilometres or ¹⁄₁₅th the annual rainfall. We may compare with this the mean discharge of Lake Victoria of about 580 cubic metres per second and ¹⁄₁₂th of the annual rainfall of its catchment basin excluding the lake area. A reference to Plate V will show how great is the regulating effect of Lake Albert on the Nile. Owing to the fact that an increase in the discharge of the Victoria Nile cannot pass down the Albert Nile before the whole area of Lake Albert has risen, the floods of the Victoria Nile are delayed nearly 5 months in their passage down the Albert Nile; a rise of 1 metre on Lake Albert meaning an increased cube of 4,500,000,000 cubic metres. If this takes place in one year, it represents an increased discharge of 150 cubic metres per second irrespective of what passes down the channel of Lake Albert. If it were considered necessary to insure 1200 cubic metres per second as the discharge of the Albert Nile from the 15th January to the 15th May, it would mean adding 400 cubic metres per second to the mean discharge for 4 months, and deducting 200 cubic metres per second from the mean discharge for the remaining 8 months. By storing the surplus waters of good years by means of a weir capable of holding up 3 or 4 metres of water at the outlet of the lake, it would be possible to insure this discharge every year during the four months which decide the summer contingent of the White Nile to the Nile in Egypt during the months of April, May, June and July. [Illustration: PLATE V. GAUGE & DISCHARGE DIAGRAM of LAKES VICTORIA & ALBERT _Luba (subsequently Jinja) gauge, near the Ripon Falls, represents Lake Victoria._ _Wadelai gauge (60 km. below Lake Albert) represents Lake Albert._ Lith. Sur. Dep. Cairo.] The shores of Lake Albert are generally steep and barren, though in places they are shelving and covered with papyrus, notably at the inlets of the Semliki river and the Victoria Nile. The Lake is fairly deep and admirably suited for a reservoir. At the outlet of the lake enormous quantities of pistea weeds, especially in high floods, enter the Albert Nile. The passage of these weeds through the future regulator of Lake Albert will be an exceedingly interesting engineering problem. The principal feeders of the lake are:-- On the north, the Victoria Nile. On the east, the Waiga, the Wakki, the Hoima, the Wahamba, the Horo, the Ngusi and Msisi, discharging between them under 20 cubic metres per second in the dry season, though good streams in flood. On the south, the Semliki; and no streams worth mentioning on the west.