From the Foreword by the Series Editor «The publication of this fourth volume of the Corpus Alchemicum Arabicum (CALA IV) is a milestone in achieving our aim to make the wealth of Arabic alchemy more easily accessible for research. Maslama b. Qasim al-Qurtubi (died 353/964), the author of this Rutbat al-ßakim, provides a basic teaching of alchemy, quoting extensively from Zosimos’ Mushaf as-suwar. Zosimos was an alchemist who lived in the 3rd/4th century and is generally considered to be the first alchemist known to us by his true name… The significance of the present publication is to be seen in the relationship to the earlier volumes of this series, especially to CALA II and CALA III. The author of the Rutbat al-hakim emphasises the importance of understanding symbols (rumuz). The publication of the Rutbat al-hakim as CALA IV rounds up the first four publications in this series: They started with the Kitab hall ar-rumuz (Book of the Explanation of the Symbols), written by the Arab alchemist Muhammad ibn Umail (10th century). Then in the next volumes, in CALA II and CALA III, there came a further clarification of the symbols given by the Greek alchemist Zosimos, and now, in CALA IV, we find an overview of the knowledge and significance of the symbols (rumuz), written by another Arab alchemist.»