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.”