Compendium of Materia Medica
"Compendium of Materia Medica" contains information that was proven to be wrong due to Li Shizhen's limited scientific and technical knowledge. For example, it is claimed that lead is not toxic. It is also claimed that otters are "always male", and that the Moupin langur is ten feet tall, has backwards feet and can be caught when it draws its upper lip over its eyes.