Without a hiding-place, or the heliotrope, a precious stone of great virtue against poisons, and supposed to render the wearer invisible. Upon this latter vulgar error is founded Boccaccio’s comical story of Calandrino and his friends Bruno and Buffulmacco, Decameron , Gior. VIII , Nov. 3. ↩

Brunetto Latini, Tresor I v 164, says of the Phoenix:⁠—