7. But there came a time when the small islands were overcrowded with the increased population, and detachments began to cross the water and land at the furthest point of the Gulf, in the land of the great rivers. Here they found a people not unpractised in several primitive arts, and possessed of some important fundamental inventions--writing, irrigation by means of canals--but deplorably deficient in spiritual development, and positively barbarous in the presence of an altogether higher culture. The Cushites rapidly spread through the land of Shumir and Accad, and taught the people with whom they afterwards, as usual, intermarried, until both formed but one nation--with this difference, that towards the north of Chaldea the Cushite element became predominant, while in the south numbers remained on the side of the Turanians. Whether this result was attained altogether peacefully or was preceded by a period of resistance and fighting, we have no means of ascertaining. If there was such a period, it cannot have lasted long, for intellect was on the side of the newcomers, and that is a power which soon wins the day. At all events the final fusion must have been complete and friendly, since the old national legend reported by Berosus cleverly combines the two elements, by attributing the part of teacher and revealer to the Shumiro-Accad's own favorite divine being Ea, while it is not impossible that it alludes to the coming of the Cushites in making the amphibious Oannes rise out of the Persian Gulf, "where it borders on Chaldea." The legend goes on to say that Oannes set down his revelations in books which he consigned into the keeping of men, and that several more divine animals of the same kind continued to appear at long intervals. Who knows but the latter strange detail may have been meant to allude fantastically to the arrival of successive Cushite colonies? In the long run of time, of course all such meaning would be forgotten and the legend remain as a miraculous and inexplicable incident.