The most thorough and extensive discussion of this subject which has so far been made, is by Dr. D. Alfredo Chavero, in the _Anales del Museo Nacional de Mexico_.[37] According to this author, who had access not only to the older as well as more recent authorities usually referred to, but also to the manuscript of Fabrigat and the Codex Chimalpopoca or Quauhtitlan, the order of the year symbols or year bearers--Tecpatl, Calli, Acatl, and Tochtli--varied "_segun les[TN-15] pueblos_," the Toltecs commencing the cycle with _Tecpatl_, those of Teotihuacan with _Calli_, those of Tezcuco with _Acatl_, and the Mexicans with _Tochtli_.[38] He also shows that the relation and order of the four ages or creations and elements in regard to the cardinal points, are by no means uniform, not only in the Spanish and early authorities, but in the codices and monuments (supposing his interpretation to be correct). His arrangement, as derived from the leading codices, is as follows: Tochtli -- South -- Earth. Acatl -- East -- Water. Tecpatl -- North -- Fire. Calli -- West -- Air. In order that the various views may be seen at a glance, I give here a tabulated _resume_: MEXICAN SYMBOLS OF THE CARDINAL POINTS. _Veytia._ 1. Tecpatl -- Flint -- Fire. 2. Calli -- House -- Earth. 3. Tochtli -- Rabbit -- Air. 4. Acatl -- Cane -- Water. _Sahagun._ 1. Tochtli -- Rabbit -- South. 2. Acatl -- Cane -- East. "Toward the fire or sun." 3. Tecpatl -- Flint -- North. "Nearly towards hell." 4. Calli -- House -- West. "Towards the house of women." _Gemelli._ 1. Tochtli -- Rabbit -- South -- Blue -- Earth -- Cipactli. 2. Acatl -- Cane -- East -- Red -- Water -- Michiztli. 3. Tecpatl -- Flint -- North -- Yellow -- Air -- Ozomatli. 4. Calli -- House -- West -- Green -- Fire -- Cozcaquauhtli. _Boturini._ 1. Tecpatl -- Flint -- South -- Fire. 2. Calli -- House -- East -- Earth. 3. Tochtli -- Rabbit -- North -- Air. 4. Acatl -- Cane -- West -- Water. _Herrera._ Calli -- House -- Green. Tochtli -- Rabbit -- Blue. Acatl -- Cane -- Red. Tecpatl -- Flint -- Yellow. _Duran._ 1. Acatl -- Cane -- East -- Green. 2. Tecpatl -- Flint -- North -- Red. 3. Calli -- House -- West -- Yellow. 4. Tochtli -- Rabbit -- South -- Blue. _Schultz-Sellack._ 1. -- ? -- Quetzalcoatl -- South -- Wind -- Yellow. 2. -- ? -- Huitzilopuchtli -- East -- Fire -- Red. 3. -- ? -- Tezcatlipoca -- North -- Water -- White. 4. -- ? -- Tlaloc -- West -- Earth -- Black. _Charencey._ 1. -- ? -- East -- Yellow. 2. -- ? -- North -- Black. 3. -- ? -- West -- White. 4. -- ? -- South -- Red.[39] _Orozco y Berra._ 1. Tochtli -- Rabbit -- South -- Air. 2. Acatl -- Cane -- East -- Water. 3. Tecpatl -- Flint -- North -- Fire. 4. Calli -- House -- West -- Earth. _Chavero._