We herewith present to our Students the following Treatise on The Science of Alchemy. It is written to serve two purposes: first, it gives the Text of the Sermon of Mind to Hermes on the Nature of the All and Good, and contains the Official Esoteric Commentary of the Hermetic Brotherhood of Atlantis; in the second place, it will be found to be the Official Text Book of the Brotherhood, for students of the Science of Alchemy. These Lessons will be found to unfold the fundamental principles of the Science of Alchemy, and of the nature of Eternal Life in a way that will be most easily understood by the student." Contents: The All and Good; God and Fon; The Fon Lore; Fonology; The Unity of Life; The One Maker of All; The Divine Workman; Life and Death; The Master's Word; Fonian Life.