“It was 1788,” Lavoisier said testily.
“What happened? I heard you were experimenting with some new explosives.”
Lavoisier said nothing.
“They must have been… efficacious. Mademoiselle Chevraud was killed in the explosion, was she not?”
Lavoisier had been goaded enough. “Yes,” he spluttered. “And that fool Le Tors. He would never listen to my instructions. And yes, it was a new gunpowder I had developed. Lethal. It was absolutely lethal, very unstable at the time. I had struck on using a different potassium salt than is usually used. The nitrate of potassium is the usual component of gunpowder, but I was using potassium muriate. Twice as powerful. I believe it liberates more oxygen in the combustion process, and as my early work on oxygen proved, this gas is—”
“Yes, yes, very well,” snapped Napoleon. “I know you can kill people. My question to you is this. Can you manufacture it again? Could you make, for example, enough for two hundred thousand men?”
Lavoisier smiled. “Give me a place to stand, and I will move the earth. Of course I can, given enough time, and money, but you have a garrison here of what? Five hundred men? What do you want with such large amounts of gunpowder?”
“Six hundred,” said Napoleon pedantically, “but the weaponry is not for Elba. Come with me.”
He stood and walked over to a small door that led off the side of the dining room. Lavoisier followed the Emperor along ornate corridors and up narrow stairs to a small study on the first floor. Napoleon fiddled with the blinds, trying to shed a little more light into the room, in the centre of which stood a large square table, the entire surface of which was covered with a detailed map of Europe.
“The best my map-makers ever made,” he said proudly. “Come and look, come and look.”
They wandered around the map, admiring its beautiful draughtsmanship, its colour and detail.
Lavoisier gazed at the map, almost speechless. A tear formed in one eye. “How much of it I saw! But how much still to see!” His hand stroked the outline of the French coast.
“You will see France again,” Napoleon said, as if soothing a child. His eyes scoured the map greedily. “In the spring we will leave this rock, you and I, and as many men as I can muster from Elba, from Sicily, from Corsica. We will land on the French coast, somewhere near Antibes, and then we will strike inland. We will march this way, through the Bas Alps, to Grenoble, thence to Rives and Lyons. Then Paris. We will arrive there without firing a shot. Undoubtedly on the way we will meet some force sent to intercept us, and I will throw my coat open and say, ‘Here is your Emperor’s breast. Kill me if you will! If not, follow me to glory!’ and the men will all fall on their knees and shout, ‘Vive L’Empereur!’ They will love me as they did before and we will depose the puppet king. Then the British and the Russians will start to fear me, and will send forces to engage me.
“Most likely I will march north-east to Brussels, and battle will be met.” He pointed at the map idly, his finger drifting, his mind playing out the military encounters like a game of chess. “Maybe here, at Wavre, or Mont-Saint-Jean, or at some godforsaken village near by, like this one, Waterloo.”
“You dream!” Lavoisier said.
“No, I know these things. This is my world and I will win these battles, with the help of your world. You will make enough of this gunpowder of yours to blow the British into the sea!”
“No,” said Lavoisier simply, “I won’t.”
“You will.”
“No,” Lavoisier repeated, “I won’t. As it happens, I have already sold the recipe to the British.”
“What!” roared Napoleon. He thundered round the table and roared at Lavoisier again. “Treachery?”
The old man held up a hand. He was not in the business of winning arguments by shouting. Napoleon fell silent.
“I had to make some money somehow. I ran out of what you gave me ten years ago. Anyway, the gunpowder is lethal. Impressive in a demonstration, maybe, but impractical in the field. Now, keep your peace and come with me. It is my turn to show you something.”
The old scientist led the way down through the bowels of the house to his improvised laboratory, where he swung the door aside to allow the Emperor in. Napoleon was still on the edge of anger, but he was impressed nonetheless.
“You have been busy,” he remarked, gazing at the apparatus that cluttered every surface and most of the floor.
Lavoisier shrugged. “This was why you kept me alive, was it not? So that this would not be lost. Let me show you something.” He fumbled through a sheaf of papers clumsily, until he found what he was looking through, and handed it to Napoleon. “Did you ever see this?”
“Never. What is it?”
“It is a machine I designed, built and tested, forty years ago. It is called the Burning Glass.”
The drawing showed a flat wooden wagon, thirty feet long, upon one end of which was mounted a huge circular glass object, a lens. It rested between two hefty metal screws which seemed intended to facilitate vertical movement. Ten feet away, and again on an adjustable track, was a smaller lens, but still perhaps four feet across. Various other handles and levers were fixed here and there.
“What does it do?”
“It annihilates things. It incinerates them, using the rays of the sun. It makes them catch fire, sometimes even explode.”
Napoleon was impressed, but Lavoisier waved his hand.
“In practical terms it is useless as a weapon, unless you can contrive to get your enemy to place his head on the focus block here. Then you could fry his brains, but only an enemy with no brains at all would be stupid enough to get so close. Not only that, but it is cumbersome: very, very heavy and hard to manoeuvre. Can you imagine that in the mud of the battlefield? We abandoned it for anything other than scientific use.”
“So why show it to me?”
“I am trying to educate you, to teach you something of the methods of the natural philosopher, to show you the agonizingly slow steps he takes towards his goal.”
“Show me the goal,” said Napoleon.
Lavoisier sighed. “Very well.”
He turned to the table behind him, and with a flourish more befitting a magician than a scientist, whipped a covering cloth away to reveal a board six feet long, upon which stood an array of mirrors and lenses, all securely bolted to the base, but all free to pivot vertically.
“This…” Lavoisier said, then stopped. He glanced out of the kitchen window. “For a man such as yourself, it will be easier to show you. Here, you will have to help me with this. I cannot lift it. Call someone, but someone you can trust.”
Napoleon nodded and turned to the kitchen steps. “Bertrand!”
The Burning Glass stood on a small table in the courtyard. Bertrand kept asking questions but Napoleon ignored him, occasionally waving him back a few feet. The Emperor himself hovered at Lavoisier’s shoulder, while the old man fiddled and adjusted and calibrated and estimated.
“Very well,” Lavoisier said finally. “It is not perhaps as perfect as I would like it, but not bad after six months at sea. Very well. So, you will observe that today is a sunny day. A winter’s day, but the sun is shining, yes? Now…” He gazed around the courtyard. “Behold the lemon tree over there. If you please.”
Napoleon and Bertrand did as they were told and turned to watch the innocent little tree growing at the far side of the three-sided courtyard. Beyond, the land fell away from the house, down to the town, down to the sea. Lavoisier made one last adjustment, then flicked a mirror so that it faced the sun directly. Instantly a focused ray of brilliant white light shot across the courtyard, where it struck the tree, which after four or five seconds of smouldering burst into flames.