cause of those diseases in water containing magnesia, but no iodine. These travels are undertaken by means of a fund provided for that purpose by the government. The plan of each expedition is first submitted to the Institute and approved. In case of very expensive undertakings, like the excavation of the Serapeum, or the expedition lately sent to Babylon, a special appropriation is obtained from the Assembly. The _Archives_ are published neatly, with the necessary engravings, at twelve francs a year. * * * * * The mystery hanging over the interior of Africa is rapidly dissipating before the zeal of the many explorers whose efforts are now devoted to traversing the centre of that continent, and, before many years have passed, there is reason to suppose, this sole remaining geographical and ethnographic problem will be fully solved. The English expeditions from the Cape of Good Hope, the German missionaries on the eastern coast, with their journeys into the highlands in the south of Abyssinia, the explorations of the English on the gold coast and up the Niger, those of the French starting from Senegal and Algiers, the travels of Knoblecher and others on the upper Nile, with the journeys of Richardson, Barth, and Overweg, must soon make us acquainted with the principal facts that have so long been the object of general curiosity, if not of exaggerated expectation. Something is also to be anticipated from the aid of Mohammedan travellers, of whom there are a great number scattered over the interior of the continent in search of adventures or with a view to make fortunes. One of these has published, in Arabic, two works containing his experiences and observations in Darfur and Waday, both of which have been translated into French by M. Perron. The second has just appeared at Paris under the title of _Voyage au Ouaday par Cheykh Mohammed Ibn Omar al Tunisi_, and is especially valuable, as Waday is a country about which we have before had little, if any, positive information. It lies south of the great desert between Timbuctoo and Darfur, and is an extensive country. It is so far advanced out of the merely savage state, as to have a sort of administration, an army, and a kind of general regulations for commerce, which it owes to the influence of Islamism, and to a great man called Sabun, who lived quite recently, or yet lives, as the chief ruler of the land. The principal trade is in slaves, who are stolen in forays among the neighboring tribes on the south, and sold to caravans going north to Fezzan, or east to Darfur; the other articles of commerce are ivory, skins, and ostrich feathers. The introduction of Islamism has put an end to human sacrifices, and rendered the tyranny of the rulers less bloody, but in other respects it has produced little social improvement.