De alchimia opuscula complura veterum philosophorum, quorum catalogum sequens pagella indicabit

But the evil sulfur, not well mixed, causes grinding between the teeth. Lead possesses gross, evil quicksilver mercury of foul and fetid taste and weak virtue, from which it is continually corrupted through the violence of fire. Thus, metallic bodies differ from quicksilver according to whether they contain extraneous or burning sulfur within them. What virtue is within them is considered thus: when a large quantity of sulfur is present, it is an imperfection, and a large quantity of quicksilver is their perfection, since quicksilver is incombustible and airy, whereas sulfur burns and is burned, and hinders perfection in every work. These are the words of Aristotle in the fourth book of the Meteorology original: "quarto metheororum":

It is not to be believed that the philosophers have been found in any lie, therefore they are most highly to be believed.

On the formation of wonders that do not derive their origin from Mercury.

Chapter V.

There are, however, lesser or middle minerals, as has been said, which do not derive their origin from Mercury. And of these, some are salts that liquefy easily with moisture, such as alum, common salt, sal-ammoniac, rock salt, and all types of salts. And some are virtuous, nor do they liquefy easily with moisture alone, such as orpiment, arsenic...