It being impossible to present here in full the data showing how certain primitive conceptions had developed further and how some human occupations had become associated with the Above and others with the Below, I will but point out the important fact that the city of Mexico, divided into four quarters, each of which had five subdivisions (calpullis), actually consisted of two distinct parts. One of these was Mexico proper, where the Great Temple stood and where Montezuma and the lords resided; the other was Tlatelolco, where the lower classes dwelt and the merchant class prevailed. After a certain revolt the inhabitants of this portion of the city were, we are told, "degraded to the rank of women" (see Bandelier, _op. et loc. cit._). From this it would seem evident that their affairs or lawsuits were settled in the official house named the Cihua-tecpaneca, whilst the affairs of the nobility, residing in Mexico proper, were disposed of in the Tlaca-tecpaneca (see Duran, chap. 3). Knowledge of the prevalence of the division of the population into two parts is gained through a passage of Ixtl-ilxo-chitl's Historia (chap. XXXV, p. 241): "To Quetzalmemalitzin was given the lordship of Teotihuacan ... with the title of Captain-general of the dominion of the noblemen. All affairs or lawsuits of the lords and the nobility belonging to the towns of the provinces situated in the plain, were to be attended to and settled in his town. The same title was bestowed upon Quechaltecpantzin of Otompan, with the difference that he was the captain-general of the commoners and attended to the affairs and claims of the commoners and populace of the provinces in the plains."
A further detail concerning the position of the ancient capital of Mexico should not be omitted, for it is described as follows by the English friar Thomas Gage, who visited it in 1625: "The situation of this city is much like that of Venice, but only differs in this, that Venice is built upon the sea-water, and Mexico upon a lake, which seeming one is indeed two; one part whereof is standing water, the other ebbeth and floweth according to the wind that bloweth. That part which standeth is wholesome, good and sweet, and yieldeth store of small fish. That part which ebbeth and floweth is a saltish bitter and pestiferous water, yielding no kind of fish, small or great" (p. 43). Added to other data, this detail seems to indicate that the geographical position of the capital had been chosen with utmost care and profound thought, so that, built on a dual island on a dual lake, it should be in itself an image or illustration of the ideas of organization which I have shown to have dominated the entire native civilization. If it be admitted, as I think is evident, that the site of the capital was chosen and mapped out in accordance with these ideas, then we undoubtedly have, in ancient Mexico, not only one of the most remarkable "Holy Cities" ever built by mankind, but also the most convincing proof of the great antiquity and high development of the civilization under whose influence one of the greatest capitals of ancient America was founded.