Study has progressed beyond this point, can tell us far more intricate and fainter facts. It argues that one by one the various tribes left their common home and became completely separated; and that each root-sound still used by all the nations represents an idea, an object, they already possessed before their dispersal. Thus we can vaguely reconstruct that ancient, aboriginal civilization. We can even guess which tribes first broke away, and where again these wanderers subdivided, and at what stage of progress. Surely a fascinating science this! And in its infancy! If its later development shall justify present promise, it has still strange tales to tell us in the future. THE RACES OF MAN Turn now from this tracing of our means of knowledge, to speak of the facts they tell us. When our humankind first become clearly visible they are already divided into races, which for convenience we speak of as white, yellow, and black. Of these the whites had apparently advanced farthest on the road to civilization; and the white race itself had become divided into at least three varieties, so clearly marked as to have persisted through all the modern centuries of communication and intermarriage. Science is not even able to say positively that these varieties or families had a common origin. She inclines to think so; but when all these later ages have failed to obliterate the marks of difference, what far longer period of separation must have been required to establish them! These three clearly outlined families of the whites are the Hamites, of whom the Egyptians are the best-known type; the Semites, as represented by ancient Babylonians and modern Jews and Arabs; and the great Aryan or Indo-European family, once called the Japhites, and including Hindus, Persians, Greeks, Latins, the modern Celtic and Germanic races, and even the Slavs or Russians. The Egyptians, when we first see them, are already well advanced toward civilization.[2] To say that they were the first people to emerge from barbarism is going much further than we dare. Their records are the most ancient that have come clearly down to us; but there may easily have been other social organisms, other races, to whom the chances of time and nature have been less gentle. Cataclysms may have engulfed more than one Atlantis; and few climates are so fitted for the preservation of man's buildings as is the rainless valley of the Nile. [Footnote 2: See the _Dawn of Civilization_, page 1.]