758 MAYAN CALENDAR SYSTEMS (ETH. ANN, 19 
These, beginning with the first in the middle space and following 
with the right slab and then with the left, are as follows: 
Middle space 
eee 537 
a 2, 386? 
Right slab 
i beeaty S 8, 034 
En N 4, 749 
Bees 123 
Mewen ee 10, 118 
ee 13, 138 
(eee 14, 176 
rita ae 15, 217 
Slee 381 
eee: 17, 367 
TON ee 7, 002? 
Left slab 
eee 2, 980 
Cater 542 
Oseee 274, 920 
4222 297, 942 
Oetne eis 479, 042 
a 9,513 
It is apparent from this list that there is an irregularly ascending 
scale following the order given, but so far no common divisor forming 
a basis of the differences has been found; moreover, the introduction 
at some three or four points of short periods seems to break in upon 
the idea of special references to the differences, as is usual in the 
Dresden codex. Besides this, the differences do not serve to connect 
dates, except possibly in two instances, while in one-third or more 
cases successfully traced individual numeral series do. 
As the exceptions alluded to above may possibly prove to be impor- 
tant factors in determining the relations of the series on this tablet, it 
will not be amiss to again notice them here. 
As is shown above, if we add two days to the first numeral series on 
the left slab, making it 2,982, and count forward from 8 Ahau 18 Tzee 
(2 Akbal), we shall reach 13 Ik 20 Mol (10 Akbal), the date following 
the second numeral series. If now we add the first numeral series as 
corrected—2,982—to the third numeral series (after deducting calen- 
dar rounds)—9,200—making a total of 12,182, and count forward 
this number of days from 8 Ahau 18 Tzee (2 Akbal). we reach 9 Ik 15 
Ceh (9 Lamat), the date following the third numeral series. If we go 
back now and subtract the second numeral series—542—from the 
tirst—2,982—which leaves 2,440 days, and count forward this number 
of days from 8 Ahau 18 Tzee (2 Akbal), we reach + Ahau 8 Cumhu 
