The Nahuatl name _cozcaquauhtli_ is the "royal zopilote" (_Sarcoramphus papa_ of ornithologists). Drs Seler and Brinton agree in the supposition that the Zapotec name is derived from _balloo_, "the raven or crow." Dr Seler says that the Quiche-Cakchiquel word _ahmak_ seems to signify the vulture, "who pecks out the eyes," "who makes deep holes;" while Dr Brinton maintains that the Quiche _ahmak_ means "the master of evil," referring to the owl, which is esteemed a bird of evil omen and bad fortune. The Pipil _tecolotl_ also denotes "the night bird or owl." [Illustration: PL. LXVII COPIES OF GLYPHS FROM THE CODICES] The Maya and Tzental names, however, present a difficulty not so easily explained. The signification of the former is "wax, gum, or copal gum," and also, according to Henderson, "root." According to Brinton the Tzental radical _chab_ means "honey, was, bee, a late meal." He refers, however, to the Cakchiquel, where he finds that _ch'ab_ means "mud, clay, mire," and suggests that "as red and black clays were the primitive pigments this may connect the Tzental day name with the Maya." Seler, however, derives the Maya name from _ci_ or _cii_, "to taste good," "to smell good;" and as _ci_ is also the name of the maguey plant, and likewise refers to the pulque or intoxicating drink from this plant, he concludes that _cib_ must have been formed by the addition of the instrumental suffix, and hence refers to that which is used for wine, "either the honey, or, more correctly, the narcotic root." This conclusion he thinks is strengthened by the fact that the corkscrew figure, which is the chief element of the _cib_ symbol, is found several times on vases or earthen vessels (see LXVII, 6). Attention is called in this connection to the fact that _loo_ in Zapotec signifies "root," which is also one of the meanings given by Henderson to the Maya _cib_, which would seem to strengthen Dr Seler's conclusion. The glyph is seldom if ever found in combination with other characters or used otherwise than as a day symbol. This, together with the fact that it is not found except as a day symbol in the beekeeper's calendar in the Troano Codex, would seem to indicate that there has been a change in the name of the day since the origin of the symbol; or, on the other hand, the symbol has been modified from some older form. Nevertheless, there are some indications that it is phonetic and that the corkscrew figure has _b_ as its chief element, whether _cib_ be the word indicated or not.