The publication by the French government of the results of the great scientific expedition to Algeria has thrown much light on the districts embraced in Algiers and the regency of Tunis, as well as on the countries far in the interior. Among the subjects which have received the particular attention of the commission, are, 1. An examination of the routes followed by the Arabs in the south of Algiers and Tunis; 2. Researches into the geography and commerce of Southern Algiers, by Capt. Carette; 3. A critical analysis of the routes of the caravans between Barbary and Timbuctoo, with remarks on the nature of the western Sahara, and on the tribes which occupy it, by M. Renou; 4. A series of interesting memoirs on the successive periods of the political and geographical history of Algiers from the earliest period to the present time, by M. Pelissier; 5. The History of Africa, translated from the Arabic of Mohammed-ben-Abi-el-Raini-el-Kairouani, by M. Remusat, giving a particular account of the earliest Musselman period. Gen. Marey in an account of his expedition to Laghouat in Algeria, published in Algiers in 1845, has contributed important information on this country, which deserves a rank with the great work of the scientific expedition.[35] In this work the author has corrected the erroneous opinion which has long been held, of the barrenness of the Sahara. Among the Arabs this word _Sahara_ does not convey the idea which the world has generally given it, of a desert or uninhabitable place, but the contrary. Like every country, it presents some excellent and luxuriant spots, others of a medium quality as to soil, and others entirely barren, not susceptible of cultivation. By _Sahara_, the Arabs mean a country of pastures, inhabited by a pastoral people; while, to the provinces between the Atlas mountains and the sea, they apply the name of _Tell_, meaning a country of cereals, and of an agricultural people. M. Carette, in his exploration of this region, has also discovered the false notion long imbibed in relation to it. "The Sahara," says he, "was for a long time deformed by the exaggerations of geographers, and by the reveries of poets. Called by some the Great Desert, from its sterility and desolation, by others the country of dates, the Sahara had become a fanciful region, of which our ignorance increased its proportions and fashioned its aspect. From the mountains which border the horizon of Tell, to the borders of the country of the blacks, it was believed that nature had departed from her ordinary laws, renouncing the variety which forms the essential character of her works, and had here spread an immense and uniform covering, composed of burning plains, over which troops of savage hordes carried their devastating sway. Such is not the nature, such is not the appearance of the Sahara."