The physiography of the river Nile and is basin . increases. The green colour is due to largequantities of microscopic algie - which are floating in the water, and itis the oil contained in some of these which gives the unpleasant tasteand smell. Since dArnaud, after his visit to the Bahr el Jebel in1841, attributed this alga3-laden water to the rising flood of that river 1 Report on the Upper Nile App. IV and Plate VIII o, p. i).» Kanfmnnn. -nevne ile IEgypte, p. lOj. Cairo, 1SU7, JAN. FEB MAR. I «! XII I XI tXI I XI XXI I 1 metres 5 I \ I t , I[7jCl I .__L 1 _! j J I I i meires » -^ -^—. 1 _
The physiography of the river Nile and is basin . increases. The green colour is due to largequantities of microscopic algie - which are floating in the water, and itis the oil contained in some of these which gives the unpleasant tasteand smell. Since dArnaud, after his visit to the Bahr el Jebel in1841, attributed this alga3-laden water to the rising flood of that river 1 Report on the Upper Nile App. IV and Plate VIII o, p. i).» Kanfmnnn. -nevne ile IEgypte, p. lOj. Cairo, 1SU7, JAN. FEB MAR. I «! XII I XI tXI I XI XXI I 1 metres 5 I \ I t , I[7jCl I .__L 1 _! j J I I i meires » -^ -^—. 1 _^ s 1i 1 V ^ 1. ^ \ > * * \i 11 \ \. 0 ^ yoM • 1 TO I 1 ^«i it* Svnrey D4f>3rtmanl. Gauge Readings, WHITE NILE. 1 wliicli loicwl (Hit ui the layddiis and marshes the sta^iiaiit water whichhad been lying tliere, later Avriters have accepted his explanation ofthis green water. It is not, however, a satisfactory one. The earliesstrise of any magnitude in the Bahr el Jebel at (loiidokoro, lat. 4° 55 N.,does not take place until June, while the green Avater is usually seenabout Dueim, lat. 14° N., in the middle of May. Observations in par-ticular years give the same result, and in 1902 the green water wasfilling the White Nile at Dueim ami northwards nearly as far asKiiartoum on May 11, on which date the liahr el .lebel at (iondokororose markedly for the first time that year. The green water at Dueim in ^lay cannot, theref(;re, Ije that whichhas been forced out of the marshes of the Bahr el Jebel bv the risinirHood. I have suggested that it ma\ be brought down the Sobat fromthe Pibor marshes, as the first rise of the Baro takes place in thel)eginning of May: l)at in lIMIo the first rise of the riv
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