Humboldt thinks that there existed other people in Mexico, previous to the arrival of the Toultecs, the date of whose appearance in Mexico he has put down at 648, of the Christian era. It matters not by what name the people who first inhabited America are called; nor does this writer name the people he supposes to have preceded the Toultecs. We have called the primitive inhabitants _Tultecans_; and we are justified by the best authorities, certainly by the most numerous, in giving them this appellation. But we think Humboldt was mistaken in the antiquity of the Tultiques. The date assigned by him for their appearance may have been when they were driven by the northern nations of Chicemecks, or perhaps by the Olmecas, from their ancient city, and forced to mingle with the other nations that about that time made their appearance in Mexico, from the north. It is possible that the dates given by writers, and purporting to have been derived from the hieroglyphic paintings of the ancient inhabitants, may have some truth for their bases; but these, liable as they were to misinterpretation, have induced writers to come to the conclusion, that no certainty exists in the dates which have been given for the population of Central America. Whether the inhabitants of Palenque, the famous ruins of which we have noticed, are the _Toultecs_ known at a subsequent period, or whether the name of that people is 'past finding out,' our means do not allow us to determine at present. That they had a different name, prior to the appearance of the Toultecs in 596 of Clavigero, or 548 of Humboldt, may be admitted. Still, it is not improbable that they may have left their country in 544, as thought by some, arrived in the valley of Mexico in 648, and founded the city of Tula in 670; but to suppose that this people afterward reared the monuments we have before mentioned, is not at all probable; on the contrary, the period of their origin supposed by the 'hypothesis' already mentioned and some three thousand years since, would be altogether more in accordance with their ruins. The Tultiques were evidently the first people known in Mexican history; but from whence they came, and the date of their first establishment in Central America, is unknown. Humboldt himself says, 'We do not know on what authority these dates are founded.' We shall speak of the people here mentioned as the _Toultecs_, and as entirely distinct from the ancient inhabitants of Palenque, though we have designated the latter by a similar name, for the sake of preserving cöincidence with others. All must be agreed, in accordance with our statement, and with Humboldt, that a people existed in Anahuac long previous to the appearance of these Toultecs we now speak of, though this distinguished traveller had no knowledge of the great ruins of Palenque.