Results of the Ivory Campaign--Preparations for starting Homeward-- Part regretfully with the Children--The Traveller's Tree--View of the Nile--Koshi and Madi--Gebel Kookoo--On Speke and Grant's Route-- Changes in the Nile--The Asua River--Suspicious Movements of the Natives--Attacked in the Pass--Night in a hostile Country--Camp surrounded by Natives--Poisoned Arrows shot into Camp--Sight Belignan --Approach Gondokoro--Arrive at Gondokoro--Neither Letters nor Supplies--Disappointment. CHAPTER XVIII. THE LATEST NEWS FROM KHARTOUM. Intelligence from Khartoum--Retreat of the Slaves--Influence gained over Traders' People--Sail from Gondokoro--The Nile cleared of its Mystery--The Victoria Source--Ptolemy's Theory--Rainfall--Affluents of the White Nile--Action of the Abyssinian Rivers--Colonization impossible--Slavery the Curse of Africa--Impotence of European Consuls --Impossibility of convicting a Trader--Central Africa opened to Navigation--Tribes of Central Africa--Vestiges of a Pre-Adamite Creation--Geological Formation--Hypothesis of Equatorial Lakes--Sir Roderick Murchison's Theories confirmed--Sir Roderick Murchison's Address CHAPTER XIX. THE BLACK ANTELOPE. Antelope shooting--Arrive at Junction of Bahr el Gazal--Arrive at the Nile Dam--Character of the Obstruction--Passage through the Dam--The Plague breaks out--Saat smitten by the Plague--Entertained by Osman Bey--Saat dies--Burial of Saat--Arrival at Khartoum--Albert Lake Reservoir of Nile--Destruction by the Plague--A Darkness that might be felt--Horrible Slave Cargo--Meet with Mahommed Her--Mahommed Her punished--Nearly wrecked--Stranded among Cataracts--Clear the Danger --Start from Berber to Souakim--A Row in the Desert--Combat with the Arabs--"Bravo, Zeneb!"--Disarm the Arabs--Cross the Mountains--First View of the Sea--Souakim--Arrival at Suez--Farewell to Africa-- Exertions appreciated LIST OF ILLUSTRATIONS.