ds of 13 days,
not in order to make them agree with the apparent course of the moon,
but to use them as weeks, and for their chronological divisions.

2 deg.. _The Weeks._

It must not be supposed that the weeks of the ancient Indians were
similar to ours, that is to say, that they were the revolution of a
period of days, each having a particular name: they were only the
revolution or successive repetition of thirteen numbers applied in
arithmetical progression to the twenty days of the month. The year
being composed of 28 weeks and one additional day or number, the course
of the years, on account of that excess, followed the arithmetical
progression of the thirteen weekly numbers; so that if a year commenced
with the number 1, the next would commence with number 2, and so on to
the close of the 13 years, which formed an indiction, or week of years,
as will be explained hereafter.

3 deg.. _The Month._

"Month" is called in the Yucateco language "U," which means also "the
moon;" and this corroborates the presumption that the Indians went on
from the computation of lunations to determine the course of the sun,
calling the months "moons." But in some manuscripts, the name of
_Uinal_ in the singular and _Uinalob_ in the plural is given to the
eighteen months which compose the year; applying this comprehensive
term to the series, and to each one of the particular names assigned to
the twenty days that composed the month.

The day was called _Kin_, "the sun;" and the particular names by which
the 20 days composing the month were designated are stated in the
following table, in which they are divided into sets of five, for the
better understanding of the subsequent explanations.

1st. 2d. 3d. 4th.
Kan. Muluc. Gix (Hix) Ca-uac.
Chicchan. Oc. Men. Ajau (Ahau).
Quimi (Cimi). Chuen. Quib (Cib). Ymix.
Manik. Eb. Caban. Yk.
Lamat. Been. Edznab. Akbal.

As those names corresponded in number with the days of the month, it
followed that, the name of the first day of the year being known, the
names of the first days of all the successive months were equally
known; and they were distinguished from each other only by adding the
number of the week to which they respectively belonged. But t