.-'.28 AIDS TO THE STUDY OF THE MAYA CODICES. 



By examining oarefully the lines and columns of the middle and 

 lower divisions of the plates — those represented in Tables XXI and 

 XXII — we ascertain that the two together form one series; but, con- 

 trary to the method whicli lias pri'vaili-d in tliose examined, it is to be 

 read from right to left. cniinifiiciiiK witli tin- rij;lit hand column of 

 the lower and ending with the left hand column of the middle divis- 

 ion. 



As proof of this we have only to note the fact that the series of 

 l)lack numerals over the day columns ascends towards the left. As- 

 suming the lowest of the three lines to be days, the middle one months, 

 and the upper one years, the common difference is 4 months and 11 

 days. Numbering the ten columns of each of our tables from left to 

 right as usiial and adding successively the common difference, com- 

 mencing with the tenth column of the lowest division, of which Cib 

 is the first day, the result will be as follows: 



'Years. Months. Days. 



4 11 Over tenth rolnmn. l<i\ver division. 



9 2 Over ninth column. li)\ver division. 



4 11 



13 13 Over eightli column, lower di\ision. 



4 11 



4 Over seventh column, lower division. 



4 11 



4 l.T Over sixth column, lower division. 



4 11 



9 6 Over tifth column, lower division. 



4 11 



13 IT Over fourth column, lower division. 

 4 11 



S Over third column, lower division. 



4 11 



4 19 Over second column, lower division. 



4 11 



9 10 Over first column, lower division. 



4 11 



14 1 Over tenth column, middle division. 

 4 11 



(I 12 Over ninth column, middle division. 



4 11 



~> 3 Over eighth column, middle division. 



4 11 



