Kolobeng failing through drought--Sebituane's country and the Lake 'Ngami--Livingstone sets out with Messrs. Oswell and Murray--Rivers Zouga and Tamanak'le--Old ideas of the interior revolutionized--Enthusiasm of Livingstone--Discovers Lake 'Ngami--Obliged to return--Prize from Royal Geographical Society--Second expedition to the lake, with wife and children--Children attacked by fever--Again obliged to return--Conviction as to healthier spot beyond--Idea of finding passage to sea either west or east--Birth and death of a child--Family visits Kuruman--Third expedition, again with family--He hopes to find a new locality--Perils of the journey--He reaches Sebituane--The chiefs illness and death--Distress of Livingstone--Mr. Oswell and he go on the Linyanti--Discovery of the Upper Zambesi--No locality found for settlement--More extended journey necessary--He returns--Birth of Oswald Livingstone--Crisis in Livingstone's life--His guiding principles--New plans--The Makololo begin to practice slave-trade--New thoughts about commerce--Letters to Directors--The Bakwains--_Pros_ and _cons_ of his new plan--His unabated missionary zeal--He goes with his family to the Cape--His literary activity. When Sechéle turned back after going so far with Livingstone eastward, it appeared that his courage had failed him. "Will you go with me northward?" Livingstone once asked him, and it turned out that he was desirous to do so. He wished to see Sebituane, a great chief living to the north of Lake 'Ngami, who had saved his life in his infancy, and otherwise done him much service. Sebituane was a man of great ability, who had brought a vast number of tribes into subjection, and now ruled over a very extensive territory, being one of the greatest magnates of Africa. Livingstone, too, had naturally a strong desire to become acquainted with so influential a man. The fact of his living near the lake revived the project that had slumbered for years in his mind--to be the first of the missionaries who should look on its waters. At Kolobeng, too, the settlement was in such straits, owing to the excessive drought which dried up the very river, that the people would be compelled to leave it and settle elsewhere. The want of water, and consequently of food, in the gardens, obliged the men to be absent collecting locusts, so that there was hardly any one to come either to church or school. Even the observance of the Sabbath broke down. If Kolobeng should have to be abandoned, where would Livingstone go next? It was certainly worth his while to look if a suitable locality could not be found in Sebituane's territory. He had resolved that he would not stay with the Bakwains always. If the new region were not suitable for himself, he might find openings for native teachers; at all events, he would go northward and see. Just before he started, messengers came to him from Lechulatebe, chief of the people of the lake, asking him to