The next article that forms one of the chief staples in Timbúktu, and in some respects even more so than gold, is salt, which, together with gold, formed articles of exchange all along the Niger from the most ancient times.[16] It is brought from Taödénni, a place whose situation has been tolerably well established by M. Caillié’s journey[17], and the mines of which have been worked, as we know from Áhmed Bábá, since the year 1596, when the former mines of Tegháza, situated some seventy miles further to the north, were given up. These salt mines of Tegháza appear to have been worked from very remote times, or at least before the eleventh century; and there can be little doubt that the mines of Tátentál, described by the excellent geographer El Bekrí as situated twenty days’ journey from Sijilmésa, and two from the beginning of the desert, are identical with Tegháza. Even at that time both Sigilmésa and Ghánata were provided from here, while at least the eastern and original portion of Songhay was supplied at that early period from the mines of Taútek, six days from Tademékka.[18] In Taödénni the salt, which covers a very extensive tract of ground in the district “El-Jóf,” is formed in five layers, or “úje,” the uppermost of which is called el-wára; the second, el-bentí; the third, el- hammamíye; the fourth, el-káhela, or the black one; and the lowest, which is embedded in the water, el-kámera, or el-bédha. The upper of these layers are of little value, and the most in request is the fourth layer, or el-káhela, the colour of which is a most beautiful intermixture of black and white, like a species of marble. The ground is let out by the “káíd,” who resides here, and whose name at the present time is Zén, in small portions, where the diggings are made, and he levies a tribute called the khomús from each hofra, or hole, the rest being sold by the workmen. The largest pieces of salt which are dug out here measure 3 feet 5 inches in length, 13 inches in height, and 2⅓ inches in thickness, but they are of very unequal size, varying from 50 to 65 lb. in weight; this, however, is only half of one layer, each layer being sawn into two slabs. The price of these slabs of course varies greatly at different times, but, as far as I became aware, in general does not reach such an exorbitant price as has been mentioned by Leo Africanus, Mr. Jackson, General Daumas, and others. When lowest, the price of each middle-sized slab does not exceed 3000 shells; and the highest price which was paid during my residence in the town was 6000, the price always rising towards spring, when the salt caravans become scarce on account of the number of blood-flies which infest the town and the neighbourhood of the river. Of course, when this great highroad is shut up for a long period, in consequence of feuds between the various tribes, the price may for a time rise much higher, but such cases must be quite exceptional.