Leiden MS. Vossianus Chym. Q. 50. 305 folios. Paper. 196x156mm. 17th Century. 1. f1-26v Philo [Hebraeus?], Liber de elementis et eorum proprietatibus. 2. f31-60v Roger Bacon, Epistula de secretis operibus artis et naturae et de nullitate magiae. 3. f61-108 Roger Bacon, De arte experimentali [Opus Maius, part VIa.] 4. f117-156 John Dastin, Rosarius philosophorum [incomplete at end.] 5. f157-167 Paulus Romanus de Vesinis, Lilium philosophorum sive commentarium in enigmata Arnaldo de Villanova. 6. f168-182v Huguccio, Lilium intelligentiae.