296 AIDS TO THE STUDY OF THE MAYA CODICES. 



one another by 8; that is to say, by adding 8 to any one and casting 

 out 13 when the sum exceeds that number, the next lower number 

 will be obtained; or, reversing the operation and counting upward, 

 the difference is found to be 5. The true interval between the days 

 of the columns (counting downwards) is 3 months (60 days), a rule 

 which holds good as to all the series and each column. Thus, from 

 3 Cib to 11 Cib is 3 months, or 60 days; from 11 Cib to 6 Cib, 3 

 months; from 3 Cimi to 10 Cimi, 3 months, and from 13 Kan to 8 Kan, 

 3 mouths. 



Counting on tlie list of the days of the month, witliout reference 

 to the week numbers attached to them, it will be found tliat from 

 Cib to Cimi is an interval of 10 days, and from Cib to Kan is an in- 

 terval of 8 days. This rule holds good as to all the series, showing 

 that all are arranged upon precisely the same plan. The true interval 

 between any day of the first column of either series (the week num- 

 ber attached being considered) and the opiaosite or corresponding day 

 in the second column, is 4 months and 10 days, that between the cor- 

 responding days of the second and third columns is 13 months and 

 10 days, that between the diiys <>f the third and fourth columns is 8 

 days, and that between the cMiTcsiKJuding days of tlie fourth or last 

 column of one series or plate and the first column of the following 

 series or plate (taking the plates in the order they are paged) is 11 

 months and 16 days. 



In order to illustrate tliis we will run through the lowest line of 

 eaoli series, taking them in the order of the 25ages.' 



Tliese are as follows: 



By counting on the calendar (our Table II), as heretofore explained, 

 the reader will observe that the interval from 8 Cib to 7 Cimi is 4 

 months and 10 days; from 7 Cimi to 10 Cib is 13 months and 10 days; 

 from 10 Cib to 5 Kan is 8 days; from 5 Kan to 7 Ahau is 11 months 

 and 16 days; from 7 Ahau to 6 Oc, 4 months and 10 days; from 6 Oc 

 to 9 Ahau, 13 months and 10 days; from 9 Ahau to 4 Lamat, 8 days; 

 from 4 Lamat to 6 Kan; 11 months and 16 days, and so on to the end 

 of the series on Plate 50. Referring to the .codex the reader will 

 observe at the bottom of each plate and directly under — that is to 

 say, in the same vertical lines as the day columns — two lines of red 

 numerals. It is impossible to determine these in Kingsborough's 

 copy (except on Plate 50), but they can readily be made out on the 



' The bottom lines are selected because they are less injured in the codex than the 

 top lines, which are in most cases entirely obliterated. 



