Raimundi Lulii maiorici philosophi acutissimi, mediciq[ue] celeberrimi, De secretis naturae siue quinta essentia libri duo : his accesserunt, Alberti Magni summi philosophi, De mineralibus & rebus metallicis libri quin[que] ; quae omnia solerti cura repurgata rerum naturae studiosis recens publicata sunt per M. Gualtherum H. Ryff, Argentinensem, medicum
Adaptation of: Johannes, de Rupescissa, approximately 1300-approximately 1365. Liber de consideratione quintae essentiae omnium rerum.
"The central work of the pseudo-Lullian alchemical corpus is the Liber de secretis naturae seu de quinta essentia. Written before the beginning of the fifteenth century, as the manuscript tradition clearly shows, [it] consists of a collection of materials, mostly from the Liber de consideratione quintae essentiae of John of Rupescissa, whch makes 1351-2 the terminus post quem for its composition. Its text varies considerably in manuscripts and printed editions, and we do not possess a vulgate nor a fortiori a critical edition."--M. Pereira, The alchemical corpus attributed to Raymond Lull (1989), page 11; also page 77, section I.39 of catalogue, listing this edition ("Strassburg 1541") and noting that all printed editions are incomplete.