309 
and two corresponding terms in the two perio- 
dical series of thirteen numbers and four signs. 
The following table presents several remarkable 
epochas of the Mexican history^ indicated ac- 
cording to the era of the Aztecks. We should 
recollect^ that these nations reckoned the num- 
ber of their cycles, or xmhmolpillis^ only from 
the year 1091 ; because, in their annals, they 
had established a new clironological order after 
their departure from Aztlan, or from the begin- 
ning of their migrations towards the south. 
