For some time past the natives had commenced a brisk trade with ivory in exchange for all kinds of trifles, which left a minimum profit for the government of 1500 per cent. A few beads, together with three or four gaudy-coloured cotton handkerchiefs, a zinc mirror, and a fourpenny butcher's knife, would purchase a tusk worth twenty or thirty pounds. I calculated all the expenses of transport from England, together with interest on capital. In some cases we purchased ivory at 2,000 per cent. profit, and both sellers and buyers felt perfectly contented.