Mellon Collection, Yale University Library MS. 88. 54 folios. Paper. 280x195mm. 18th Century [c. 1725.] Arcana divina [In German and Latin.] [Illustrated with folding pen and wash drawing showing in the upper centre of a cloudy sky the Sun, whose rays are seen to be aimed especially at three double burning lenses set on pedestals, the two on each side act upon glass vessels set on tables, while the other in the centre, supported by two angelic figures burns material in a plate.] [From the Julius Kohn Collection.]