Stanley returned to England from Zanzibar, arriving in December, 1877. The King of the Belgians had been planning an expedition to open up the Congo country to trade, and now requested Stanley to take command of his expedition. Stanley undertook the management of the new organization and returned to Africa in 1879, where he remained nearly six years, hard at work on the Congo, making roads, establishing stations, and opening the way for commerce. The Congo Free State, founded by King Leopold, lies chiefly south of the great bend of the river, and contains an area of 1,508,000 square miles, with a population of more than 42,000,000. The articles collected from the African trade at points along the great river, are ivory, palm-oil, gum, copal, rubber, bees-wax, cabinet woods, hippopotamus teeth and hides, monkey skins, and divers other things. Stanley now made brief visits to Europe and the United States. While he was in this country, in the winter of 1886 and 1887, he was summoned back to Europe to take once more command of an African expedition to rescue Emin Pasha, governor of the province of Equatorial Africa. Emin is the Egyptian name of Dr. Schnitzler. He has been generally known throughout Africa as Emin Pasha, and was governor of the province which is one of the outlying posts of the Egyptian government, when the revolt in the Soudan took place. When General Gordon was besieged in Khartoum, the province of Emin Pasha was cut off from the rest of Egypt, and Emin was shut up in the region north of the Albert Nyanza, whose capital is Lado, on one of the minor branches of the White Nile.