The canon came one day to the priest’s lodging, and asked to borrow some money. ‘Can you lend me a gold mark?’ he asked him. ‘I only need it for three days. Then I will repay you. If I let you down, I give you leave to hang me from the nearest tree!’

The priest took the coin from his purse straight away, and gave it to him; the canon pocketed it, thanked him, and went on his way. Three days later he promptly returned the money, much to the surprise and delight of the priest. ‘Well, really,’ the priest said to him, ‘I don’t mind lending you money, good sir, if you repay it so readily. You are true to your word. That is clear enough. How can I refuse you anything in the future?’

‘What? You never thought I would trick you, did you? Please. Honesty is my middle name. I will always keep my word, to the day I die. God forbid that I should ever lie to you or deceive you. It just won’t happen. Believe me when I say that I have always paid my debts. I have never let anyone down. There is not a false bone in my body.’ He lowered his voice a little. ‘Since you have been so good to me, I will let you in on a little secret. You have been kind to me, and I will be kind in return. I am willing to teach you, if you are willing to learn, the secrets of my work as an alchemist. If you watch carefully, I can assure you that you will see a wonder.’

‘Is that right?’ the priest replied. ‘Go ahead, for God’s sake.’

‘I will do it if you wish. For no other cause but to please you.’

‘Of course.’

Do you see how this villain lured his prey? He granted the priest a favour the priest had not asked for. That kind of favour bodes no good. I will prove that to you in a moment. And so this false canon, this root of iniquity, took great pleasure in betraying good Christian people. The devil planted wickedness in his heart. God give us the grace to withstand his wiles!

The poor priest had no idea, of course. He never saw the trap being laid for him. Oh silly innocent man! You will soon be blinded by avarice. Unfortunate priest, you have lost your way. All unawares, you are falling into the clutches of a fox who will trick you and deceive you. Let me hurry on now to the conclusion – and to your confusion. I will display your folly and stupidity. And I will reveal, as far as I am able, the wickedness of the man who led you forward.

Do you think I am talking about my master? Not at all. I am talking about another canon, a hundred times more skilful than the man I serve. He has betrayed more people than you can imagine. It is impossible to describe all of his falsehoods. Whenever I talk about him, my cheeks grow red with shame. Well, they would grow red if they could. I know well enough that I have no colour left in my face. The glow left my cheeks when I first began working among the stinks and fumes. Anyway, listen to the false canon.

‘Sir,’ he said to the priest, ‘get your servant to buy some quicksilver. Tell him to hurry. Two or three ounces of the stuff will suffice. When he comes back with it, I will show you a miracle. Something you have never seen before.’

‘Of course,’ replied the priest. ‘Right away.’ So he ordered his servant to go to the apothecary, and purchase three ounces of quicksilver. The boy rushed off, and returned very quickly with the material. He gave it to the canon, who laid it down carefully. The canon then asked the servant to bring some coals, and to start a fire. This was promptly done.

Once the coals had started burning the canon took a crucible from the folds of his cloak. He showed it to the priest. ‘Take hold of it,’ he said. ‘I want you to do this for yourself. Pour into this crucible an ounce of the quicksilver. In the name of Christ, we will make an alchemist of you yet. There are very few people to whom I would confide my secrets. I will show you how to harden this quicksilver. In front of your eyes I will make it as fine and as durable as the silver in your purse. You can test it with your teeth, if you like. If you prove me wrong, then you can reveal me as a liar and a fraud to the whole world. I have a powder here, in my pocket, that will do all. It cost me a lot of money, but it is worth it. It is the agent of all my work, as you shall soon see. Tell your boy to leave the room, by the way, and shut the door behind him. No one else must learn our secrets.’

So the silly priest obeyed him, got rid of the servant, and closed the door. Then they set to work. At the bidding of the false canon he put the crucible on the burning coals, and blew upon the fire with all his might. Then the canon sprinkled some white powder into the crucible. I don’t know what it was – chalk, powdered glass, something like that. Whatever it was, it was worthless. It was only there to fool the priest. The canon told him to pile up the coals. ‘In token of the great love I bear you,’ he said, ‘I will show you how your own two hands can work the miracle.’

‘God save you! A thousand thanks!’ replied the priest, who was now busily stoking up the fire.

While he was occupied, the false canon – this foul wretch, this servant of the devil – took out from his sleeve a piece of charcoal made of beechwood. A little hole had been drilled in the side of this coal, which the canon had filled up with metal filings; he had then sealed the hole with wax, so that none of the silver could escape. He had made this device a few hours before, and had brought it with him. I will tell you later what other tools he carried with him to deceive his victim. He wanted to rob the priest of everything before he left him. It angers me when I talk about him. I want to catch him. I want to trap him. But he is here and there and everywhere. He is so various. He is as fluid as quicksilver itself.

Now listen carefully to what followed. He hid the hollow coal in his hand while the priest was bent over the fire. ‘Dear friend,’ he said, ‘you are doing this wrong. Let me have a go. I do feel sorry for you, too, sweating like a pig. Here. Take my handkerchief. Dry your face.’ While the priest was wiping his eyes, the canon quickly slipped the coal into the middle of the crucible. It was soon burning away merrily, just like all the others.

‘Let us stop for a drink,’ the canon said. ‘We deserve it. All will be well now, I know it. Sit down for a moment and rest.’ When the hollow coal was ablaze, of course, the silver filings blended together and flowed into the bottom of the crucible. The priest knew nothing of the trick, and assumed that all the coals were alike. He could not see the deception the canon had practised on him. Now the alchemist saw his opportunity. ‘Come over here, sir,’ he said, ‘and stand by me. I know very well that you do not have a mould for the metal. Can you go outside, and find or purchase a block of chalk. I will carve it into the proper shape. At the same time can you bring with you a bowl or pan of cold water? Then you will witness the wonderful workings of the art. I know you trust me but, to be doubly sure, I will not leave your sight. I will accompany you everywhere you go.’

So they left the chamber, carefully locking it behind them. They found the materials and, to make a long story short, the canon carved the chalk into the shape of an oblong mould. How did he know how to mould it? When the priest was not looking he took a bar of silver from the sleeve of his gown and fashioned the mould around it; then he concealed the silver in his sleeve once more. It weighed no more than an ounce. You will hear more about this bar later on.

For his next trick the canon poured the material from the fire into the mould, and then plunged it into cold water. He turned to the priest, and asked him to feel the interior of the mould. ‘You will find silver there, I believe.’ Of course he did. These were the silver filings hidden in the coal of beech, now fired into one ingot. What else could they be? So the priest did as he was requested. Lo and behold, he brings out a rod of fine silver.