Vienna 3124, 15th century, fols. 49-53, Texili, “Liber secretorum de virtutibus 12 herbarum secundum influentiam quam recipiunt a 12 celestibus signis.” Judging by their varying length, I should imagine that some of the MSS listed in the preceding notes contain the Thessalus also. [715] “Tesalus in secretis de xii herbis per signa celi et de vii secundum planetas.” [716] Digby 147, 14th century, fol. 106. [717] See above chapters 13, 45. [718] Royal 12-C-XVIII, 14th century (?), Baleni de imaginibus. Sloane 3826, 17th century, fols. 100v-101, Liber Balamini sapientis de sigillis planetarum. Sloane 3848, 17th century, fols. 52-8, 59-62, liber sapientis Balemyn de ymaginibus septem planetarum. [719] _Opera_ ed. Borgnet, X, 641, “Belenus, liber de horarum opere, ‘Dixit Belenus qui et Apollo dicitur, imago....;’ liber de quatuor imaginibus ab aliis separatis, ‘Differentia in qua fiunt imagines magnae....’” [720] Berthelot (1893) I, 257-8. [721] See below, chapter 49, pp. 281-3. CHAPTER XLVII PRESTER JOHN AND THE MARVELS OF INDIA Medieval notions of the marvels of India--India’s real contribution to knowledge--The legend of Prester John--Miracles of the Apostle Thomas--Otto of Freising on Prester John--Prester John’s letter to the Emperor Manuel--Marvels recounted by Prester John--Additional marvels in later versions--The letter of Pope Alexander III--Philip, the papal physician. [Sidenote: Medieval notions of the marvels of India.] In a twelfth century manuscript at Berlin a treatise on precious stones and their medicinal and other marvelous virtues which is ascribed to St. Jerome,[722] opens with a prologue describing a voyage to India, the home of the carbuncle, emerald, and other gems, and the land of mountains of gold guarded by dragons, griffins, and other monsters. According to this prologue the navigation of the Red Sea is extremely dangerous and takes six months, while another full year is required to cross the ocean to India and the Ganges.