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Cleidophorus Mystagogus
The pseudonym for W.(illiam) Yworth [Y-Worth], a spagyrick physician, chemist and "Philosopher by Fire" from Rotterdam; an associate of Isacc Newton who acted as a patron.

Two major published works where written under the pen-name Mystagogus:
"Mercury's Caducean rod." The second edition. London, 1704
"Trifertes sangani, or immortal dissolvent." London, 1705.

In addition his other published works are a six-chapter version of 'Processus Mysterii Magni Philosophicus', in English; Prefaced by 'A short Epistle to my Children'. Dated 1702, and signed 'Wiliam Yarworth V.D.' This is the only known instance of this author calling himself 'Yarworth': in all his other printed or manuscript material he appears as 'Yworth', 'Y-worth' or 'Y.worth'. This has often been taken as an abbrevation of 'Yarworth', but Figala and Petzold suggest ('Alchemy in the Newtonian circle', 181-2) that it may rather be an anglicisation of a Dutch form such as Ijvaert, as the author was by his own account Dutch by birth.

"The Whole Art of Distillation", 1692, later became titled as the second edition printed in London, 1705 by J. Taylor as "The compleat distiller " used the surname Y-Worth.

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