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Rh in this district seem to have been of a tower-like nature. Two varieties are shown, one on a square foundation, the other on a circular ground-plan and sometimes with a peculiar domed roof. Further north still, at La Quemada in Zacatecas, occurs an extremely interesting group of ruins, built along a lofty ridge. These remains, the most northerly yet discovered bearing a distinctly "Mexican" character, cover an extensive area and display considerable complexity. The flanks of the hills forming the ridge are built up steeply with terraced walls, and the summits are artificially levelled and broadened with terraces. The lower works seem to be of a defensive nature, and the more important buildings above consist of an intricate series of foundation-mounds, sunk courts, and occasional pyramids. From the summit radiates a system of stuccoed roads, most of which terminate in small pyramids lower down. The quadrangular arrangement of the more important structures is very noticeable, and one of the larger halls evidently possessed a roof supported on large circular pillars, built, like the walls and terraces, of unsquared stone blocks set in earth mixed with grass. The Spaniards found the ruins uninhabited, and the surrounding agricultural and hunting population of Zacatec stated that the inhabitants had migrated in the direction of Mexico after a drought lasting several years.

With the exception of the pyramid at Teayo, described above, which seems to be an Aztec ruin, the architectural remains of the Huaxtec and Totonac appear in certain respects to resemble rather those of the Maya, their linguistic relations to the south. At the same time it is advisable to make some mention of them in this place, firstly because the coastal region in this direction had been subjected for some time to Aztec influences, and secondly because Aztec pottery cannot be adequately described without reference to