4. In consequence of a treaty with the neighbouring republic of Cyrene, the whole territory extending between the two Syrtes was also ceded to the Carthaginians. The Lotophagi and Nasamones, inhabitants of this district, preserved their nomad mode of life; they must, however, from their trade with the interior parts of Africa, have been of the highest importance to Carthage. 5. System of colonization, and, as a necessary result, that of conquest without Africa. It was evidently the aim of the Carthaginians to settle on islands, and to subject them to their dominion. Those lying in the western part of the Mediterranean occupied the first place in their plan of conquest, which was completely executed in Sardinia, the Baleares, and other small islands; perhaps in Corsica; in Sicily, however, they could never succeed to the full extent of their wishes. There is also every probability that the Canary islands and Madeira were entirely in their possession. On the other hand, the Carthaginians, previous to their wars with Rome, were in the practice of establishing separate settlements on the main land, partly in Spain, and partly on the western shore of Africa. In the latter, they adopted the policy of their ancestors, the Phoenicians, making the settlements so small, and confining them within such narrow bounds, that the mother country might always ensure their dependence. 6. The glory of extending the territory of Carthage, by important conquests, belongs principally to the family of Mago, who, together with his two sons and six grandsons, established the dominion of the republic in Sicily, Sardinia, and Africa. This occurred about the same time that Cyrus, Cambyses, and Darius were laying the foundation of the Persian monarchy, with which Carthage even then entered into connection. The Carthaginians, therefore, made their first appearance, as extensive conquerors, in the fourth century from the foundation of their commonwealth; and it is at this period that mention is made of their first naval engagement, in which the Phocaeans were their adversaries. In the same period may be dated the establishment of their colonies beyond the Pillars of Hercules by Hanno and Himilco--both probably sons of Mago;--by the former on the coast of Africa, by the latter on that of Spain. To the same period likewise is referred the first commercial treaty between the Carthaginians and Romans, in which the former appear as already masters of Sardinia, Africa, and a portion of Sicily.