| Cipactli | Ehecatl | Calli | Cuezpallin | Coatl |
| Crocodile | Wind | House | Lizard | Snake |
| Miquiztli | Mazatl | Tochtli | Atl | Itzcuintli |
| Death | Deer | Rabbit | Water | Dog |
| Ozomatli | Malinalli | Acatl | Ocelotl | Quauhtli |
| Monkey | Herb | Reed | Jaguar | Eagle |
| Cozcaquauhtli | Olin | Tecpatl | Quiahiutl | Xochitl |
| Vulture | Movement | Stone | Rain | Flower |
Fig. 77. Variant Forms of Aztecan Day Signs: a, acatl, arrow; b, mazatl, deer foot; c, malinalli, jaw bone; d, itzcuintli, dog’s ear; e, ozomatli, monkey’s ear; f, ocelotl, jaguar’s ear.
Fig. 78. Aztecan Numbers and Objects of Commerce: a, 1; b, 20; c, 400; d, 8,000; e, ten faces carved from precious stone; f, twenty bags of cochineal dye; g, one hundred bales of cocoa; h, four hundred bales of cotton; i, four hundred jars of honey of tuna; j, eight thousand leaf bundles of copal gum; k, twenty baskets each containing sixteen hundred ground cacao nibs; l, four hundred and two blankets.
The hieroglyphs of the twenty days of the month (see [Fig. 76]) are frequently represented, but those of the eighteen months are not nearly so well known. As for the gods, the faces are usually pictured, especially when these are grotesque, but sometimes details of dress or an object connected with a special ceremony is sufficient to recall the divinity. The Mexican system of numbers was based on twenties. The units were figured by dots, the twenties by flags, the four hundreds by a device like a tree that represented hair, and the eight thousands by the ceremonial pouches in which copal incense was carried.
[Plate XLVI.]
Page from the Tonalamatl Section of the Codex Borbonicus. The thirteen days run along the bottom of the page and up the right side of the large division. The period covered is one-twentieth of the Tonalamatl of 260 days. At the left of each day is seen one of the nine Lords of the Night, so-called, in orderly succession. In the divisions above or to the left of the days are the thirteen gods of the Hours of the Day in connection with the Thirteen Birds. The patron goddess of this division of the Tonalamatl is Itzpapalotl, the obsidian butterfly. The other pictures relate mostly to mythological instances and the details of ceremonies. For instance, the broken tree represents Tamoanchan, a legendary site, and the sacrifice of twenty birds is indicated by the flag attached to the bleeding head of a decapitated bird.