 Hernández was a writer who had to cautiously orchestrate two different themes.He had to show respect toward medieval medicine's own mixture of mythical creatures, magical powers, and miraculous events, and mysterious sympathies while fulfilling his professional mission and recording his personal evaluation of native health practices.In the Natural History of Pliny, Hernandez points out his own dissections of human cadavers at Guadalupe and the dissection of a chameleon.