Glasgow University Library MS. Ferguson 105. 93 folios. 230x155mm. 15th or early 16th Century. [Works of Ramon Lull.] 1. f1-56v Liber secretorum nature seu quinte essentie. 2. f56v-85v De Practica figure fundamentalis et arboris philosophorum diximus. 3. f86-92 Speculum Alkimie. [Many circular and tree diagrams and some drawings of apparatus, throughout the text.] [See Ramon Lull, 'De secretis naturae sive quinta essentia...', Argentorati, 1541.]