CHAPTER I.

As Don J. Pio Perez counts every year as having 365 days, and without regard to the omitted bissextile days, it is clear that the day in the Yucatan calendar, on which the transit of the sun by the zenith of any one place occurs, would vary twenty days, or a whole Indian month, in the course of eighty years. This would create such confusion that, if it be a well ascertained fact, that the Yucatan year began on the zenith day, this renders