Glasgow University Library MS. Ferguson 228. 8 folios on vellum. 334x223mm. 15th Century. 1. f1-2 Tractatus de lapidibus philosophorum. [Begins]: 'Quod lapis noster sit.' 2. f3-5r Incipit Reymundus [Galfredus]. [Begins]: Verbum abbreviatum verissimum et approbatum de occultum emittat breve sermone a brevia. [Roger Bacon, 'De Leone Viridi', edited by Raymundus Galfredus (D.W. Singer no. 193), printed in Roger Bacon, 'Sanioris Medicinae. De Arte Chymiae scripta... opuscula alia eiusdem', Frankfurt, 1603.] 3. f5v-6v Conclusiones philosoph de Elixir. [Begins]: 'Hermes pater philosophorum dixit... In primis corpus solutus et aqua...' [See Thorndike-Kibre p. 612, Liber secretus de floribus philosophorum 4. f6v-7 Hic incipit tractatus optimus in quo exponit et aperte declarat... [D.W. Singer no. 157, 'Plinius Philosophis Secretum Secretorum', Cambridge University Library MS. K.k.VI. f129v-131 (15th Century).] [Front cover, not original binding, has 'Roger Bacon MS'. ]