Eudoxus: 2 books

The Six Keys of Eudoxus Eudoxus of Cnidus (410 or 408 BC ­ 355 or 347 BC) was a Greek astronomer, mathematician, physician, scholar and student of Plato. Since all his own works are lost, our knowledge of him is obtained from secondary sources, such as Aratus's poem on astronomy. Theodosius of Bithynia's Sphaerics may be based on a work of Eudoxus.

"The Six Keys" by the Greek astronomer Eudoxus of Cnidus is a classic alchemic text about six ways to complete the opus.