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British Library MS. Sloane 3132.
Paper. Quarto. 66 folios. 15th Century.
1. Tractatus sic intitulatus, 'Optima ars medicinalis', revera, Johannis de Rupescissa de Quinta Essentia Libri duo. ff.1-38.
Begins: 'Dixit Salomon Sapien. cap ViII.' Printed in Duodecimo, Basil 1597.
At end there is written: 'Finitus est presens tractatus de Quinta Essentia, anno Dni. MCCCCLXX.