The Turba Philosophorum is indisputably the most ancient extant treatise on Alchemy in the Latin tongue, but it was not, so far as can be ascertained, originally written in Latin; the compiler or editor wrote either in Hebrew or Arabic; however, the work, not only at the present day, but seemingly during the six or seven centuries when it was quoted as an authority by all the alchemical adepts, has been familiar only in its Latin garb. It is not, of course, certain that the original is irretrievably lost, the Arabic and Syriac manuscripts treating of early chemistry are preserved in considerable numbers in the various libraries of Europe, and have only been imperfectly explored. There are two codices or recensions of The Turba Philosophorum, which differ considerabu from one another. The longer recension has been chosen for the text of this translation, because it seemed more complete, clearer, and less corrupt.