It lends a substantial basis to the theories of those who regard the Medes as one of the principal primeval races; who believe that they were well known to the Semitic inhabitants of the Mesopotamian valley as early as the twenty-third century before Christ--long ere Abraham left Ur for Harran; and that they actually formed the dominant power in Western Asia for more than two centuries, prior to the establishment of the first Chaldaean kingdom.
And if there are thus distinct historical grounds for the notion of an early Median development, there are not wanting these obscurer but to many minds more satisfactory proofs wherewith comparative philology and ethnology are wont to illustrate and confirm the darker passages of ancient history.

Recent linguistic research has clearly traced among the Arba Lisun, or, "Four Tongues" of ancient Chaldaea, which are so often mentioned on the ancient monuments, an Arian formation, such as would naturally have been left in the country, if it had been occupied for some considerable period by a dominant Arian power.

The early Chaldaean ideographs have often several distinct values; and when this is the case, one of the powers is almost always an Arian name of the object represented.

Words like nir, "man", ar, "river," (compare the names Aras, Araxes, Endanus, Rha, Rhodanus, etc., the Slavonic rika, "river," etc.), san, "sun," (compare German Sonne, Slavonic solnce, English "sun," Dutch zon, etc.), are seemingly Arian roots; and the very term "Arian" (Ariya, "noble") is perhaps contained in the name of a primitive Chaldaean monarch, "Arioch, king of Ellasar." There is nothing perhaps in these scattered traces of Arian influence in in Lower Mesopotamia at a remote era that points very particularly to the Medes; but at any rate they harmonize with the historical account that has reached us of early Arian power in these parts, and it is important that they should not be ignored when we are engaged in considering the degree of credence that is to be awarded to the account in question.
Again, there are traces of a vast expansion, apparently at a very early date, of the Median race, such as seems to imply that they must have been a great nation in Western Asia long previously to the time of the Iranic movements in Bactria and the adjoining regions.

In the Matieni of Zagros and Cappadocia, in the Sauro-matae (or Northern Medes) of the country between the Palus Maeotis and the Caspian, in the Maetae or Maeotae of the tract about the mouth of the Don, and in the Maedi of Thrace, we have seemingly remnants of a great migratory host which, starting from the mountains that overhang Mesopotamia, spread itself into the regions of the north and the north-west at a time which does not admit of being definitely stated, but which is clearly anti-historic.