The Turba Philosophorum or Assembly of the Sages Called Also the Book of Truth in the Art and the Third Pythagorical Synod
by A.E. Waite
1896
Called also The Book of Truth in the Art and the Third Pythagorical Synod (reprint of a 1914 edition). "The Turba Philosophorum is indisputably the most ancient extant treatise on Alchemy in the Latin tongue." This text is in English.