Leiden MS. Vossianus Chym. F. 26. 322 folios. Paper. 310x200mm. 16th Century [1567.] 1. f1-3 [Alchemical notes of later date, i.e. 17th Century.] 2. f6-101 Alchimica Paracelsi, constans variis formulis et experimentis [Sudhoff, 75.] 3. f113-139 Tractatus de Alchimia. 4. f138-179 [Alchemical processes.] 5. f179-182 Opus XII mensium labore constans. 6. f182-211v [Alchemical processes, continued.] 7. f212-213v Receptum Secretum [see MS. Vossianus Chym. F. 11, f142v-144v.] 8. f213v-223v Tres Ordines perfectionis metallorum [see MS. Vossianus Chym. F. 11, f144v-158.] 9. f224-269v [Alchemical processes, continued. See MS. Vossianus Chym. F. 11, f215.] 10. f270-280 Isaac, De proiectione [see MS. Vossianus Chym. F. 11, f215v-229.] 11. f280-318 [Alchemical processes, continued.] [All these works are in German.]