Before proceeding further, let us pause and inquire into the reason why the name Tlaloc, which is formed of tlalli=earth and is defined by Duran, for instance, as meaning "an underground passage or a great cave" (_op. cit._, chap. 84), should be the well-known title of the "god of rain." The explanation is to be found in the text of the Vatican Codex, A. Kingsborough, V, p. 190. This teaches us that the last syllable of the name Tlaloc does not represent oc=inside of, but stands for octli, the name of the native wine now known as pulque, which is obtained from the agave plant. Tlaloc thus meant "earth-wine" and "by this metaphor they wanted to express that just as the fumes of wine make mankind gay and happy, so the earth when saturated with water, is gay and fresh and produces its fruits and cereals." By the light of this explanation we see that the titles conferred upon Montezuma's coadjutor were literally "the priest or lord, or dealer-of-fire in the place of the earth-wine." "The clouds, rain, thunder and lightning were attributed to the lord Tlaloc who had many tlalocs and priests under him, who cultivated all foods necessary for the body, such as maize, beans, etc., and sent the rains so that the earth should give birth to all of its products. During their festival in springtime the priests went through the streets dancing and singing and carrying a shoot of green maize in one hand and a pot with a handle in the other. In this way they went asking for the [ceremonial] boiled maize and all fanners gave them some" ... (Sahagun, book VI, chap. 5).
The above and many scattered allusions throw light upon the group of ideas associated with the Cihuacoatl and clearly indicate what were his duties. To him devolved the care of the earth and his one thought was to secure abundance of rain and of crops. In order to ensure the proper cultivation of the ground, he had, under him, innumerable agents, who strictly superintended the cultivation of all food-plants, the irrigation of barren lauds, etc. These agents, who also resorted to ceremonial usages in order to bring rain or avert hail-storms and other disasters, were collectively named "the 400 pulque or octli-gods"--an appellation which developed into tochtli-gods, when the rabbit (=tochtli) had become the pictograph habitually employed to convey the sound of the word octli, and had been adopted as the symbol of the earth and of prolific reproduction in connection with this. The latter idea is born out of the female title, that of the earth-mother, who "always brought forth twins." The Cihuacoatl thus stands out as the representative of the bountiful mother-earth and as the lord of agriculture, one of whose duties was the careful collection, storage and distribution of all food products. He presided over the cult of the fertility of the earth, of the nocturnal heaven, of the stars and moon, which were associated with the female principle and with growth in general. The following record proves that amongst his other duties he offered sacrifices to the invisible hidden powers of darkness and earth. "During the night, in the feast Tititl, the high priest named Tlillan tlenamacac [=the dealer with fire in the land of darkness=tlilli=black, evidently a title analogous to that of Tlill-potonqui-cihuacoatl, given by Tezozomoc, in Cronica, chap. 33], sacrificed a victim in honour of the god of the Underworld" (Sahagun, book II, appendix). In this, as on similar occasions, he was assisted by four priests who succeeded him in rank.