While these improvements were going on so prosperously in the central and northern territory of the descendents of Cush, their brethren to the south were not idle, they had extended themselves along the mountains that run parallel to the Arabian Gulf; which was in all times called Saba, or Azabo, both which signify _South_, not because Saba was south of Jerusalem, but because it was on the south coast of the Arabian Gulf, and, from Arabia and Egypt, was the first land to the southward which bounded the African Continent, then richer, more important, and better known, than the rest of the world. By that acquisition, they enjoyed all the perfumes and aromatics in the east, myrrh, and frankincense, and cassia; all which grow spontaneously in that stripe of ground, from the Bay of Bilur west of Azab, to Cape Gardefan, and then southward up in the Indian Ocean, to near the coast of Melinda, where there is cinnamon, but of an inferior kind. Arabia probably had not then set itself up as a rival to this side of the Red Sea, nor had it introduced from Abyssinia the myrrh and frankincense, as it did afterwards, for there is no doubt that the principal mart, and growth of these gums, were always near Saba. Upon the consumption increasing, they, however, were transplanted thence into Arabia, where the myrrh has not succeeded. The Troglodyte extended himself still farther south. As an astronomer, he was to disengage himself from the tropical rains and cloudy skies that hindered his correspondent observations with his countrymen at Meroë and Thebes. As he advanced within the southern tropic, he, however, still found rains, and made his houses such as the fears of a deluge had instructed him to do. He found there solid and high mountains, in a fine climate; but, luckier than his countrymen to the northward, he found gold and silver in large quantities, which determined his occupation, and made the riches and consequence of his country. In these mountains, called _the Mountains of Sofala_, large quantities of both metals were discovered in their pure unmixed state, lying in globules without alloy, or any necessity of preparation or separation. The balance of trade, so long against the Arabian and African continents, turned now in their favour from the immense influx of these precious metals, found in the mountains of Sofala, just on the verge of the southern tropical rains.