Arm rings are made from solid brass rod about ⁷⁄₁₆ in. thick and are usually 2½ in. to 3½ in. in diameter—they are also made in large quantities from brass tubes of ½ in. to ⅝ in. diameter, more frequently from ⁹⁄₁₆ in., the rings being from 2½ in. to 3½ in. in diameter, and weighing from 2½ to 4 oz. each52.
Slaves and ivory tusks form the chief units in the same region. The slave usually is worth a tusk. In other parts pieces of precious wood of a red colour, each piece being a foot long, were employed as currency53.
When we come to regions where the ox can live we at once find that animal occupying a foremost place. Thus when the Cape of Good Hope was first colonized, the Hottentots employed cattle and bars of iron of a given size as currency54, and at the present moment the cow is the regular unit among the Zulus, ten cows being the ordinary price paid for a wife, although as in Homeric Greece fancy prices are paid by the chiefs for ladies of uncommon attractions. But our chief interest must centre in the peoples north of the Equator, who from time immemorial have been in contact with the ancient civilization of the Mediterranean.
Thus among the Madis of Central Africa, a pure negro tribe, cattle form the chief wealth; a rich man may have as many as 200 head, a very poor one only 3 or 4. The average number possessed by one man is from 30 to 40. They keep the milk in gourds.
“A regular system of exchange is carried on in arrows, beads, bead necklaces, teeth necklaces, brass rings for the neck and arms, and bundles of small pieces of iron in flat, round, or oval discs. All these different articles are given in exchange for cattle, corn, salt, arrows, etc. The nearest approach to money is seen in the flat, round pieces of iron which are of