The profession of the slave-trader, unless it be that of his contemporary, the pirate preying under his black flag, is the one which holds you with the most grewsome and fascinating interest. Its inhumanity, its legends of predatory expeditions into unknown jungles of Africa, the long return marches to the Coast, the captured blacks who fall dead in the trail, the dead pulling down with their chains those who still live, the stifling holds of the slave-ships, the swift flights before pursuing ships-of-war, the casting away, when too closely chased, of the ship's cargo, and the sharks that followed, all of these come back to one as he walks the shore-wall of Mozambique. From there he sees the slave-dhows in the harbor, the jungles on the mainland through which the slaves came by the thousands, and still come one by one, and the ancient palaces of the Portuguese governors, dead now some hundreds of years, to whom this trade in human agony brought great wealth, and no loss of honor. [Illustration: Chain-gangs of Petty Offenders Outside of Zanzibar.] Mozambique in the days of her glory was, with Zanzibar, the great slave-market of East Africa, and the Portuguese and the Arabs who fattened on this traffic built themselves great houses there, and a fortress capable, in the event of a siege, of holding the garrison and all the inhabitants as well. To-day the slave-trade brings to those who follow it more of adventure than of financial profit, but the houses and the official palaces and the fortress still remain, and they are, in color, indescribably beautiful. Blue and pink and red and light yellow are spread over their high walls, and have been so washed and chastened by the rain and sun, that the whole city has taken on the faint, soft tints of a once brilliant water-color. The streets themselves are unpeopled, empty and strangely silent. Their silence is as impressive as their beauty. In the heat of the day, which is from sunrise to past sunset, you see no one, you hear no footfall, no voices, no rumble of wheels or stamp of horses' hoofs. The bare feet of the native, who is the only human being who dares to move abroad, makes no sound, and in Mozambique there are no carriages and no horses. Two bullock-carts, which collect scraps and refuse from the white staring streets, are the only carts in the city, and with the exception of a dozen 'rikshas are the only wheeled vehicles the inhabitants have seen.