An Aztec Herbal by William Gates Originally written in the Aztec language, this 16th-century codex was the first herbal and medical text compiled in the New World. It contains ancient remedies for myriad ailments — boils, hair loss, cataracts, insomnia hiccoughs, and gout, to name a few. Analytical Index to Plants. New Introduction. Over 180 black-and-white and 38 color illustrations.