Note 51 — INTRODUCTION.

To perpetuate the memory of this philosophic deduction he caused to be constructed at Tezcuco a stone tower nine stories in height, the ruins of which were visible long after the Spanish occupation. To this tower he gave the name Chililitli, a term of uncertain meaning, but which we find was applied in Tenochtitlan to a building sacred to the Nine Winds.51 To explain the introduction of this number, I should add that a certain school of Nahuatl priests taught that the heaven above and the earth below were each divided into nine concentric arcs, each leading farther and farther away from the conditions of the present life. Hence, there were nine heavens, abodes of the gods, and nine lower regions, abodes of the souls of the dead. Another school taught that there were not nine but thirteen of these stages.