last black number, 9, is wrong; it should be 8, a fact noticed by
Foerstemann.[290-2] Making this correction, the series is regular and
consistent, so far as it relates to the right hand column, which has the
red thirteen over it. But there is no series for the left hand column.
Can it be that those who used the manuscript were expected to find the
proper numbers by the line given? Possibly this is the reason the other
series is not written out, as by adding one to each red number we obtain
the proper result, which, if written out, would be as follows: 1, II; 5,
VII; 10, IV; 13, IV; 15, VI; 3, I.

In Plate 30_c_ are the four day columns here given, with the numeral
eleven over each:

XI XI XI XI
Ahau Chicchan Oc Men
Caban Ik Manik Eb
Ix Cauac Kan Muluc
Chuen Cib Ymix Cimi
Lamat Been Ezanab Akbal.

Extending from the right of this group is a numeral series consisting of
nine pairs of numbers, each pair the same, 13, XI. The sum of the black
numbers (nine 13's) is 117 and the interval between the successive days
of each column is 117; thus, from 11 Ahau to 11 Caban is 117 days, and so
on down to Lamat, the last of the left hand column. From 11 Lamat to 11
Chicchan (first day of second column) is also 117, and so on to the end
of the fourth column. These four columns, therefore, form one continuous
series of 2,223 days, commencing with 11 Ahau and ending with 11 Akbal;
but, by adding 117 days more, so as to bring us back to 11 Ahau--which
appears to be in accordance with the plan of these series--the sum is
2,340 days, or nine cycles of 260 days each.[291-1]

The interval between the days, without reference to the numbers attached
to them, is 17. It may be well to notice here the relation of the
intervals between the days when counted in the two ways: (1) the apparent
interval, or that which indicates their position in the month; (2) the
true interval between the days, indicated by the symbols and numbers.
When the first is 6 the latter, as we have found, is 20; when the first
is 12 the latter is 52; when the first is 5 the latter is 65, and when it
is 17 the latter is 117.

Particular attention is also called here to the fact that so far no
indications of the use of the year period of 365 days have been observed;
on the contrary the cycle of 260 days appears to be the period to which
reference is c