This early connection, however, is very problematical. We have seen that there seems to be in early Egyptian civilization an element ultimately of Babylonian origin, and that there are two theories as to how it reached Egypt. One supposes that it was brought by a Semitic people of Arab affinities (represented by the modern Grallas), who crossed the Straits of Bab el-Man-deb and reached Egypt either by way of the Wadi Hammamat or by the Upper Nile. The other would bring it across the Isthmus of Suez to the Delta, where, at Heliopolis, there certainly seems to have been a settlement of a Semitic type of very ancient culture. In both cases we should have Semites bringing Babylonian culture to Egypt. This, as we may remind the reader, was not itself of Semitic origin, but was a development due to a non-Semitic people, the Sumerians as they are called, who, so far as we know, were the aboriginal inhabitants of Babylonia. The Sumerian language was of agglutinative type, radically distinct both from the pure Semitic idioms and from Egyptian. The Babylonian elements of culture which the early Semitic invaders brought with them to Egypt were, then, ultimately of Sumerian origin. Sumerian civilization had profoundly influenced the Semitic tribes for centuries before the Semitic conquest of Babylonia, and when the Sumerians became more and more a conquered race, finally amalgamating with their conquerors and losing their racial and linguistic individuality, they were conquered by an alien race but not by an alien culture. For the culture of the Semites was Sumerian, the Semitic races owing their civilization to the Sumerians. That is as much as to say that a great deal of what we call Semitic culture is fundamentally non-Semitic. In the earliest days, then, Egypt received elements of Sumerian culture through a Semitic medium, which introduced Semitic elements into the language of the people, and a Semitic racial strain. It is possible. that both theories as to the routes of these primeval conquerors are true, and that two waves of Semites entered the Nile valley towards the close of the Neolithic period, one by way of the Upper Nile or Wadi Hammamat, the other by way of Heliopolis.