The population constituting the Egyptian nation, and included in this graded structure of castes, was of varied origin and descent, or, according to a common form of statement, belonged to various races. But the process of mixing the various ethnic elements with each other, went on uninterruptedly during the almost countless centuries of the historical existence of Egypt, including the epoch of its highest political development and the brightest blossom of its culture and civilization. In the remotest period of Egyptian society, the three superior castes were of a different hue of skin from the others, and some ethnologists and historians assign them a Shemitic or Japhetic (_i.e._, Aryan) origin. But the optimates were not white but _red_, and so they both considered and called themselves. All the other castes--as artists, architects, merchants, mechanics, operatives, sailors, agriculturists and shepherds--undoubtedly belonged to the African or negro stock. Egypt teemed with an active industrial population, which furnished countless soldiers to the army during long centuries of victory. Egyptian history embraces a long period of expansion. Many centuries lay between the times of the Rhameses and of Necho, during which the Egyptians conquered Nubia, Libya, and Syria, and reached Kolchis. These armies could not be recruited--and positively _were not_--from chattel slaves; for succeeding chapters will show that it was domestic slavery far more than political which tore the sinews from the arms of the nations of antiquity, and rendered defenceless their states, empires and republics. If the officers of the Egyptian armies were of a _red_ extraction, the rank and file was undoubtedly of the negro family. Herodotus says that "the Egyptians were black and had short, crisped hair," and that "the skulls of the Egyptians were by far thicker than those of the Persians--so that they could scarcely be broken by a big stone, while a Persian skull could be broken by a pebble." Such were the elements, with so many, and such varied hues of skin, or pigments mixed, which constituted the Egyptian people--which formed a society so strong and compact that, for more than forty centuries, its influence and existence constitute one of the most significant phenomena of the antique world. These hybrid elements elaborated a civilization called by modern ethnologists Cushitic or Chamitic, in contradistinction to the Shemitic and to the Japhetic[4] (or Aryan.) The pre-eminent active elements in this civilization were the artists, merchants, and operatives. It was eminent for mathematical and astronomical science, for architecture, the mechanic arts, and a highly elaborated administration. And this Egyptian or Chamitic civilization, too, preceded by many centuries the Shemitic and Aryan cultures.