The brig sailed on the 12th of July for the Mauritius, which was reached on the 12th of August. Poor Sekwebu had become a favourite both with men and officers, and was gaining some knowledge of English, though all he saw had apparently affected his mind. The sight of a steamer, which came out to tow the brig into the harbour, so affected him that during the night he became insane and threatened to throw himself into the water. By gentle treatment he became calmer, and Dr Livingstone tried to get him on shore, but he refused to go. In the evening his malady returned; and, after attempting to spear one of the crew, he leaped overboard and, pulling himself down by the chain cable, disappeared. The body of poor Sekwebu was never found. After remaining some time at the Mauritius, till he had recovered from the effects of the African fever, our enterprising traveller sailed by way of the Red Sea for old England, which he reached on the 12th of December, 1856. Dr Livingstone, in the series of journeys which have been described, had already accomplished more than any previous traveller in Africa, besides having gained information of the greatest value as regards both missionary and mercantile enterprise. He had as yet, however, performed only a small portion of the great work his untiring zeal and energy have prompted him to undertake. CHAPTER TWENTY ONE. DR. LIVINGSTONE'S SECOND EXPEDITION TO AFRICA, TO EXPLORE THE ZAMBESI. LEAVES ENGLAND--ARRIVES AT THE EAST COAST--UP THE LUAWE--THE LITTLE "MA-ROBERT"--WAR--COMMENCE THE VOYAGE FOR TETE--SENNA--ARRIVES AT TETE-- THE KEBRABASA FALLS--RETURNS TO TETE--UP THE SHIRE, AND RETURN--THE SECOND TRIP UP THE SHIRE--SETS OUT FOR LAKE SHIRWA--RETURNS TO TETE--SET OUT FOR LAKE NYASSA--TREACHERY--ARRIVE AT THE LAKE--RETURNS TO THE KONGONE--JOURNEY WESTWARD--A PONDORO--SUPERSTITION--PASSING KEBRABASA, ARRIVE IN MPENDE'S TERRITORY--REACHES MOACHEMBA--SETS OUT FOR VICTORIA FALLS--TUBA, THE SMASHER OF CANOES--LEAVE SESHEKE--MORE SUPERSTITION-- REACH ZUNIBO--DOWN THE KEBRABASA RAPIDS--CANOES UPSET--ARRIVE AT TETE-- THE CHAMELEON. After spending rather more than a year in England, Dr Livingstone again set out, on the 10th of March, 1858, on board HMS "Pearl," at the head of a government expedition for the purpose of exploring the Zambesi and the neighbouring regions. He was accompanied by Dr Kirk, his brother Charles Livingstone, and Mr Thornton; and Mr T. Baines was appointed artist to the expedition. A small steamer, which was called the "Ma-Robert," in compliment to Mrs Livingstone, was provided by the government for the navigation of the river. The East Coast was reached in May.