Spurious Attributions in Renaissance Alchemical Literature.
“The Processus sub forma missae and its author were not unknown to the alchemists of the early modern era. The text was printed in the famous anthology of alchemical literature, the Theatrum Chemicum (Chemical Theater), by Lazarus Zetzner in 1602.
This point needs to be emphasized because the confusion in the literature concerning both the person and the work of Melchior is so great that it is hard to differentiate between evidence and legends even with regard to such simple things as the bibliographical data of his published text.
Melchior’s portrait appears on the title page of the Symbola Aureae Mensae Duodecim Nationum (The Symbols of the Golden Table of the Twelve Nations) by Michael Maier (1568–1622), the alchemist of Emperor Rudolf II. In this international history of the royal art, Melchior is chosen to represent Hungary among the twelve most famous alchemists of the world, and thus he appears in the noble company of Hermes Trismegistos, Maria the Jewess, Avicenna, Albertus Magnus, Roger Bacon, and Raimundus Lullus.
He is mentioned and quoted by such authors and editors of the sixteenth and seventeenth centuries as Daniel Stolz von Stolzenberg, Petrus Borelius, Libavius, and Athanasius Kircher. Even Isaac Newton was acquainted with Melchior’s name; relying on Maier’s description, he incorporated a number of Latin notes on a wide range of alchemical authors and myths in one of his many alchemical manuscripts, among these a few references to the alchemist of Transylvania.”
–Benedek Lang, Unlocked Books: Manuscripts of Learned Magic in the Medieval Libraries of Central Europe, 2008. Pg. 145.