 ", the Chaldeans, the Metoposcopists, the Magicians, and those who practice divination by astronomy.Hippolytus closes this book by explaining the connection he perceives between the Gnostic heresies of Valentinus and Simon Magus and certain ideas Hippolytus ascribes to Pythagoras, thus linking his discussion of Greek philosophy in Book I with his later arguments against Gnosticism.Book V concerns itself with the Ophite heresies.