The Hermetic Arcanum (Arcanum Hermeticum) was originally written in Latin and published in 1623 by Jean d’Espagnet, signed using the motto “Penes nos unda Tagi”. Espagnet was an Alchemist and Mystic, and the Arcanum describes the procedure of one school of Alchemists in the search for the secret of the Philosopher’s Stone. || The Collectanea Hermetica is a 10 volume set of Occult Hermetic books edited by William Wynn Westcott. The volumes are as follows: 1) Hermetic Arcanum, 2) The Divine Pymander, 3) A Short Enquiry Concerning the Hermetic Art, 4) Æsch Mezareph, 5) Somnium Scipionis, 6) Chaldæan Oracles of Zoroaster, 7) Euphrates, or the Waters of the East, 8) Egyptian Magic, 9) Numbers, 10) Sepher Yetzirah. || The volumes include several original translations, commentaries, and copious notes. It is a valuable resource for all students of Hermeticism, Alchemy, Kabalah and western esotericism in general.