Mellon Collection, Yale University Library MS. 128. 51 folios. Paper. 321x197mm. 18th Century [c. 1780.] Georg von Welling. The rise, properties and use of sulphur, and of mercury [extracts from Opus mago-cabalisticum et theosophicum, parts II-III, anonymously translated into English.] [This is a continuation of Mellon MS. 127.]