Renaissance chemical symbols. From Oswald Crolii, Basilica Chymica (Frankfurt, 1609).
Renaissance chemical symbols. From Oswald Crolii, Basilica Chymica (Frankfurt, 1609).
Back cover illustration: Paracelsian-era discussions often took place within a complex framework of symbols such as those shown here. Woodcut in Johann Daniel Mylius, Opus medico-chymicum ..., Vol. 1 (Francofurti, 1618-1620).