Medicine, which thou hast brought to this honourable estate, and high degree, and it shall retaine the Steele or Leade, that it fly not from the fire: it shall make it white, and purge it from his drosse and blacknesse, and conuert it into a tincture perpetually abiding. Then take a dramme of these two hundred and fiftie, and proiect it vpon two hundred and fiftie drammes of Steele or Copper, and it shall conuert it into Siluer, better then that of the Myne. This is the greatest and last worke that it can effect, if God will. CHAP. XVI. _The conuersion of the foresaid stone into red._ And if thou desirest to conuert this masterie into Golde, take of this medicine (which as I saide, thou hast brought to this honourable estate and excellencie) the waight of one dramme (and this after the manner of thy former example) and put it in a vessell, and bury it in hors-dung for fortie dayes, and it shall be dissolued: then thou shalt giue it water of the dissolued body to drink, first as much as amounteth to halfe his waight, afterward vntill it bee congealed, thou shalt bury it in moyst hot dung, as is aboue sayd. Then thou shalt orderly proceed in this Chapter of Gold, as thou hast done in the former Chapter of Siluer: and it shall be Golde, and make Golde God willing. My Sonne keepe this most secret Booke, and commit it not vnto the handes of ignorant men, being a secret of the secretes of God: For by this meanes thou shalt attaine thy desire. Amen. _Here endeth the secrets Alchimy, written in Hebrew by_ Calid, _the sonne of_ Iarich. An excellent discourse of the admirable force and efficacie of Art and Nature, written by the famous Frier _Roger Bacon, Sometime fellow of Merton Colledge, and afterward of Brasen-nose in Oxford_.