"MY LORD,--I hope your highness will either burn this letter after reading it, or else preserve it with the greatest care. It will be better, however, to make a copy in cypher, and to burn the original. My attachment to you is not my only motive in writing; I confess my interest is equally concerned. Allow me to say that I do not wish your highness to esteem me alone for any qualities you may have observed in me; I wish you to become my debtor by the inestimable secret I am going to confide to you. This secret relates to the making of gold, the only thing of which your highness stands in need. If you had been miserly by nature you would be rich now; but you are generous, and will be poor all your days if you do not make use of my secret. "Your highness told me at Riga that you would like me to give you the secret by which I transmuted iron into copper; I never did so, but now I shall teach you how to make a much more marvellous transmutation. I should point out to you, however, that you are not at present in a suitable place for the operation, although all the materials are easily procurable. The operation necessitates my presence for the construction of a furnace, and for the great care necessary, far the least mistake will spoil all. The transmutation of Mars is an easy and merely mechanical process, but that of gold is philosophical in the highest degree. The gold produced will be equal to that used in the Venetian sequins. You must reflect, my lord, that I am giving you information which will permit you to dispense with me, and you must also reflect that I am confiding to you my life and my liberty. "The step I am taking should insure your life-long protection, and should raise you above that prejudice which is entertained against the general mass of alchemists. My vanity would be wounded if you refuse to distinguish me from the common herd of operators. All I ask you is that you will wait till we meet before undertaking the process. You cannot do it by yourself, and if you employ any other person but myself, you will betray the secret. I must tell you that, using the same materials, and by the addition of mercury and nitre, I made the tree of projection for the Marchioness d'Urfe and the Princess of Anhalt. Zerbst calculated the profit as fifty per cent. My fortune would have been made long ago, if I had found a prince with the control of a mint whom I could trust. Your character enables me to confide in you. However, we will come to the point.