XVI. : concerning the Universal Matter of the Philosophers' Stone. Chapter XVII. : con-

cerning the Preparation of the Matter for the Philosophic Stone. Chapter XVIII. : concerning Instruments and the Philosophic Vessel. Chapter XIX. : concerning the Secret Fire of the Philosophers. Chapter XX. : concerning the Ferment of the Philosophers, and the Weight.
Concerning the Spirits of the Planets 72
Prologue. The First Treatise. - Chapter I. : concerning Simple Fire. Chapter II.: concerning the multiplicity of Fire from whence spring the varieties of Metals. Chapter