Chapter 3. Departure from Kolobeng, 1st June, 1849-- Companions--Our Route--Abundance of Grass--Serotli, a Fountain in the Desert--Mode of digging Wells--The Eland--Animals of the Desert--The Hyaena--The Chief Sekomi--Dangers--The wandering Guide--Cross Purposes--Slow Progress--Want of Water-- Capture of a Bushwoman--The Salt-pan at Nchokotsa--The Mirage--Reach the River Zouga--The Quakers of Africa-- Discovery of Lake Ngami, 1st August, 1849--Its Extent--Small Depth of Water--Position as the Reservoir of a great River System--The Bamangwato and their Chief--Desire to visit Sebituane, the Chief of the Makololo--Refusal of Lechulatebe to furnish us with Guides--Resolve to return to the Cape--The Banks of the Zouga--Pitfalls--Trees of the District-- Elephants--New Species of Antelope--Fish in the Zouga. Chapter 4. Leave Kolobeng again for the Country of Sebituane-- Reach the Zouga--The Tsetse--A Party of Englishmen--Death of Mr. Rider--Obtain Guides--Children fall sick with Fever-- Relinquish the Attempt to reach Sebituane--Mr. Oswell's Elephant-hunting--Return to Kolobeng--Make a third Start thence--Reach Nchokotsa--Salt-pans--"Links", or Springs-- Bushmen--Our Guide Shobo--The Banajoa--An ugly Chief--The Tsetse--Bite fatal to domestic Animals, but harmless to wild Animals and Man--Operation of the Poison--Losses caused by it-- The Makololo--Our Meeting with Sebituane--Sketch of his Career--His Courage and Conquests--Manoeuvres of the Batoka-- He outwits them--His Wars with the Matebele--Predictions of a native Prophet--Successes of the Makololo--Renewed Attacks of the Matebele--The Island of Loyelo--Defeat of the Matebele-- Sebituane's Policy--His Kindness to Strangers and to the Poor-- His sudden Illness and Death--Succeeded by his Daughter--Her Friendliness to us--Discovery, in June, 1851, of the Zambesi flowing in the Centre of the Continent--Its Size--The Mambari-- The Slave-trade--Determine to send Family to England--Return to the Cape in April, 1852--Safe Transit through the Caffre Country during Hostilities--Need of a "Special Correspondent" --Kindness of the London Missionary Society--Assistance afforded by the Astronomer Royal at the Cape.