He has to fight the dragon offspring of Ares and the bands of armed men who spring from the dragon's teeth which were sown, that is, the clouds and gloom of the overcast sky.

He conquers, and is rewarded, but does not recover his sister.
[Footnote 1: Sir George W.Cox, _Ibid._, p.

76.] When we find that the name Cadmus is simply the Semitic word _kedem_, the east, and notice all this mythical entourage, we see that this legend is but a lightly veiled account of the local source and progress of the light of day, and of the advantages men derive from it.

Cadmus brings the letters of the alphabet from the east to Greece, for the same reason that in ancient Maya myth Itzamna, "son of the mother of the morning," brought the hieroglyphs of the Maya script also from the east to Yucatan--because both represent the light by which we see and learn.
Egyptian mythology offers quite as many analogies to support this interpretation of American myths as do the Aryan god-stories.
The heavenly light impregnates the virgin from whom is born the sun-god, whose life is a long contest with his twin brother.

The latter wins, but his victory is transient, for the light, though conquered and banished by the darkness, cannot be slain, and is sure to return with the dawn, to the great joy of the sons of men.