On reaching Mazaro, the mouth of a narrow creek which in floods communicates with the Quillimane river, we found that the Portuguese were at war with a half-caste named Mariano _alias_ Matakenya, from whom they had generally fled, and who, having built a stockade near the mouth of the Shire, owned all the country between that river and Mazaro. Mariano was best known by his native name Matakenya, which in their tongue means "trembling," or quivering as trees do in a storm. He was a keen slave- hunter, and kept a large number of men, well armed with muskets. It is an entire mistake to suppose that the slave trade is one of buying and selling alone; or that engagements can be made with labourers in Africa as they are in India; Mariano, like other Portuguese, had no labour to spare. He had been in the habit of sending out armed parties on slave- hunting forays among the helpless tribes to the north-east, and carrying down the kidnapped victims in chains to Quillimane, where they were sold by his brother-in-law Cruz Coimbra, and shipped as "Free emigrants" to the French island of Bourbon. So long as his robberies and murders were restricted to the natives at a distance, the authorities did not interfere; but his men, trained to deeds of violence and bloodshed in their slave forays, naturally began to practise on the people nearer at hand, though belonging to the Portuguese, and even in the village of Senna, under the guns of the fort. A gentleman of the highest standing told us that, while at dinner with his family, it was no uncommon event for a slave to rush into the room pursued by one of Mariano's men with spear in hand to murder him. The atrocities of this villain, aptly termed by the late governor of Quillimane a "notorious robber and murderer," became at length intolerable. All the Portuguese spoke of him as a rare monster of inhumanity. It is unaccountable why half-castes, such as he, are so much more cruel than the Portuguese, but such is undoubtedly the case. It was asserted that one of his favourite modes of creating an impression in the country, and making his name dreaded, was to spear his captives with his own hands. On one occasion he is reported to have thus killed forty poor wretches placed in a row before him. We did not at first credit these statements, and thought that they were merely exaggerations of the incensed Portuguese, who naturally enough were exasperated with him for stopping their trade, and harbouring their runaway slaves; but we learned afterwards from the natives, that the accounts given us by the Portuguese had not exceeded the truth; and that Mariano was quite as great a ruffian as they had described him. One expects slave-owners to treat their human chattels as well as men do other animals of value, but the slave-trade seems always to engender an unreasoning ferocity, if not blood-thirstiness.