At the last of the tenth Ahau Katun is ended the joining together of thirteen katuns (which is) written on the face of the katun circle; one doubling of the katuns, as it is called, will then finish its course, and another katun will begin and will end as the eighth katun; this begins a second time, as it began (at first) and was then written. In other words, if I do not miss the writer's meaning, the repetitions of the great cycle of thirteen katuns were not counted from either of its terminals, to wit, the thirteenth or the second katun, but from the tenth katun. These repetitions were called _uuɔ katun_, the doubling or foldings over of the katuns, and they were inscribed on the circle or wheel of the katuns at that part of it where the tenth katun was entered. These wheels were called _u pet katun_, the circle of the katuns, or _u met katun_, the wheel of the katuns, or _u uazaklom katun_, the return of the katuns. I have several copies of them, and one is given in Landa's work, but I know of none which is a genuine original, and, therefore, it is not surprising that I do not find on any of them the signs referred to adjacent to the tenth katun. For the convenience of the reader I have drawn up the following chronological table of the events referred to in the Chronicles, arranging them under the Great Cycles and Katuns to which they would belong were the former numbered according to the regular sequence given on page 59. I have also inserted the katuns which were omitted by the native chroniclers, but which, according to that sequence, are necessary in order to complete their records in accordance with the theory of the Maya calendar. The references in Roman numerals are to the different chronicles. SYNOPSIS OF MAYA CHRONOLOGY. _Great Cycle._ _Katun._