Are you all right? Only there's steam coming off your head.'
'I do feel . . . er . . .'
Detritus blinked. There was a tinkle of falling ice. Odd things were happening in his skull.
Thoughts that normally ambulated sluggishly around his brain were suddenly springing into vibrant, coruscat-ing life. And there seemed to be more and more of them.
'My goodness,' he said, to no-one in particular.
This was a sufficiently un-troll-like comment that even Cuddy, whose extremities were already going numb, stared at him.
'I do believe,' said Detritus, 'that I am genuinely cogitating. How very interesting!'
'What do you mean?'
More ice cascaded off Detritus as he rubbed his head.
'Of course!' he said, holding up a giant finger. 'Superconductivity!'
'Wha'?'
'You see? Brain of impure silicon. Problem of heat dissipation. Daytime temperature too hot, processing speed slows down, weather gets hotter, brain stops completely, trolls turn to stone until nightfall, ie, colder-temperature,however,lowertemperatureenough,brain operatesfasterand—'
'I think I'm going to freeze to death soon,' said Cuddy.
Detritus looked around.
'There are small glazed apertures up there,' he said.
'Too hi' to rea', e'en if I st' on y'shoulders,' mumbled Cuddy, slumping down further.
'Ah, but my plan involves throwing something through them to attract help,' said Detritus.
'Wha' pla'?'
'I have in fact eventuated twenty-three but this one has a ninety-seven per cent chance of success,' said Detritus, beaming.
'Ha'nt got an'ting t'throw,' said Cuddy.
'I have,' said Detritus, scooping him up. 'Do not worry. I can compute your trajectory with astonishing precision. And then all you will need to do is fetch Captain Vimes or Carrot or someone.'
Cuddy's feeble protests described an arc through the freezing air and vanished along with the window glass.
Detritus sat down again. Life was so simple, when you really thought about it. And he was really thinking.
He was seventy-six per cent sure he was going to get at least seven degrees colder.
Mr Cut-Me-Own-Throat Dibbler, Purveyor, Merchant Venturer and all-round salesman, had thought long and hard about going into ethnic foodstuffs. But it was a natural career procession. The old sausage-in-a-bun trade had been falling off lately, while there were all these trolls and dwarfs around with money in their pockets or wherever it was trolls kept their money, and money in the possession of other people had always seemed to Throat to be against the proper natural order of things.
Dwarfs were easy enough to cater for. Rat-on-a-stick was simple enough, although it meant a general improvement in Dibbler's normal catering standards.
On the other hand, trolls were basically, when you got right down to it, no offence meant, speak as you find . . . basically, they were walking rocks.
He'd sought advice about troll food from Chryso-prase, who was also a troll, although you'd hardly know it any more, he'd been around humans so long he wore a suit now and, as he said, had learned all kindsa civilized things, like extortion, money-lending at 300 per cent interest per munf, and stuff like that. Chrysoprase might have been born in a cave above the snowline on some mountain somewhere, but five minutes in Ankh-Morpork and he'd fitted right in. Dibbler liked to think of Chrysoprase as a friend; you'd hate to think of him as an enemy.
Throat had chosen today to give his new approach a try. He pushed his hot food barrow through streets broad and narrow, crying:
'Sausages! Hot sausages! Inna bun! Meat pies! Get them while they're hot!'
This was by way of a warm up. The chances of a human eating anything off Dibbler's barrow unless it was stamped flat and pushed under the door after two weeks on a starvation diet was, by now, remote. He looked around conspiratorially – there were always trolls working in the docks – and took the cover off a fresh tray.
Now then, what was it? Oh, yes . . .
'Dolomitic conglomerates! Get chore dolomitic conglomerates heeyar! Manganese nodules! Manganese nodules! Get them while they're . . . uh . , . nodule-shaped.' He hesitated a bit, and then rallied. 'Pumice! Pumice! Tufa a dollar! Roast limestones—'
A few trolls wandered up to stare at him.
'You, sir, you look . . . hungry,' said Dibbler, grinning widely at the smallest troll. 'Why not try our shale on a bun? Mmm-mmm! Taste that alluvial deposit, know what I mean?'
C. M. O. T. Dibbler had a number of bad points, but species prejudice was not one of them. He liked anyone who had money, regardless of the colour and shape of the hand that was proffering it. For Dibbler believed in a world where a sapient creature could walk tall, breathe free, pursue life, liberty and happiness, and step out towards the bright new dawn. If they could be persuaded to gobble something off Dibbler's hot-food tray at the same time, this was all to the good.
The troll inspected the tray suspiciously, and lifted up a bun.
'Urrh, yuk,' he said, 'it's got all ammonites in it! Yuk!'
'Pardon?' said Dibbler.
'Dis shale,' said the troll, 'is stale.'
'Lovely and fresh! Just like mother used to hew!'
'Yeah, and there's bloody quartz all through dis granite,' said another troll, towering over Dibbler. 'Clogs the arteries, quartz.'
He slammed the rock back on the tray. The trolls ambled off, occasionally turning around to give Dibbler a suspicious look.
'Stale? Stale! How can it be stale? It's rockl' shouted Dibbler after them He shrugged. Oh, well. The hallmark of a good businessman was knowing when to cut your losses.
He closed the lid of the tray, and opened another one.
'Hole food! Hole food! Rat! Rat! Rat-onna-stick! Rat-in-a-bun! Get them while they're dead! Get chore—'
There was a crash of glass above him, and Lance-Constable Cuddy landed head first in the tray.
'There's no need to rush, plenty for everyone,' said Dibbler.
'Pull me out,' said Cuddy, in a muffled voice. 'Or pass me the ketchup.'
Dibbler hauled on the dwarf's boots. There was ice on them.
'Just come down the mountain, have you?'
'Where's the man with the key to this warehouse?'
'If you liked our rat, then why not try our fine selection of-'
Cuddy's axe appeared almost magically in his hand.
'I'll cut your knees off,' he said.
'GerhardtSockoftheButchers'Guildiswhoyouwant.'
'Right.'
' Nowpleasetaketheaxeaway.'
Cuddy's boots skidded on the cobbles as he hurried off.
Dibbler peered at the broken remains of the cart. His lips moved as he calculated.
'Here!' he shouted. 'You owe – hey, you owe me for three rats!'
Lord Vetinari had felt slightly ashamed when he watched the door close behind Captain Vimes. He couldn't work out why. Of course, it was hard on the man, but it was the only way . . .
He took a key from a cabinet by his desk and walked over to the wall. His hands touched a mark on the plaster that was apparently no different from a dozen other marks, but this one caused a section of wall to swing aside on well-oiled hinges.
No-one knew all the passages and tunnels hidden in the walls of the Palace; it was said that some of them went a lot further than that. And there were any amount of old cellars under the city. A man with a pick-axe and a sense of direction could go where he liked just by knocking down forgotten walls.
He walked down several narrow flights of steps and along a passage to a door, which he unlocked. It swung back on well-oiled hinges.
It was not, exactly, a dungeon; the room on the other side was quite airy and well lit by several large but high windows. It had a smell of wood shavings and glue.
'Look out!'
The Patrician ducked.
Something batlike clicked and whirred over his head, circled erratically in the middle of the room, and then flew apart into a dozen jerking pieces.
'Oh dear,' said a mild voice. 'Back to the drawing tablet. Good afternoon, your lordship.'
'Good afternoon, Leonard,' said the Patrician. 'What was that?'
'I call it a flapping-wing-flying-device,' said Leonard da Quirm, getting down off his launching stepladder. 'It works by gutta-percha strips twisted tightly together. But not very well, I'm afraid.'
Leonard of Quirm was not, in fact, all that old. He was one of those people who started looking venerable around the age of thirty, and would probably still look about the same at the age of ninety. He wasn't exactly bald, either. His head had just grown up through his hair, rising like a mighty rock dome through heavy forest.
Inspirations sleet through the universe continuously. Their destination, as if they cared, is the right mind in the place at the right time. They hit the right neuron, there's a chain reaction, and a little while later someone is blinking foolishly in the TV lights and wondering how the hell he came up with the idea of pre-sliced bread in the first place.
Leonard of Quirm knew about inspirations. One of his earliest inventions was an earthed metal nightcap, worn ini the hope that the damn things would stop leaving their white-hot trails across his tortured imagination. It seldom worked. He knew the shame of waking up to find the sheets covered with nocturnal sketches of unfamiliar siege engines and novel designs for apple-peeling machines.
The da Quirms had been quite rich and young Leonard had been to a great many schools, where he had absorbed a ragbag of information despite his habit of staring out of the window and sketching the flight of birds. Leonard was one of those unfortunate individuals whose fate it was to be fascinated by the world, the taste, shape and movement of it . . .
He fascinated Lord Vetinari as well, which is why he was still alive. Some things are so perfect of their type that they are hard to destroy. One of a kind is always special.
He was a model prisoner. Give him enough wood, wire, paint and above all give him paper and pencils, and he stayed put.
The Patrician moved a stack of drawings and sat down.
'These are good,' he said. 'What are they?'
'My cartoons,' said Leonard.
'This is a good one of the little boy with his kite stuck in a tree,' said Lord Vetinari.
'Thank you. May I make you some tea? I'm afraid I don't see many people these days, apart from the man who oils the hinges.'
'I've come to . . .'
The Patrician stopped and prodded at one of the drawings.
'There's a piece of yellow paper stuck to this one,' he said, suspiciously. He pulled at it. It came away from the drawing with a faint sucking noise, and then stuck to his fingers. On the note, in Leonard's crabby backward script, were the words: 'krow ot smees sihT: omeM'.
'Oh, I'm rather pleased with that,' said Leonard. 'I call it my “Handy-note-scribbling-piece-of-paper-with-glue-that-comes-unstuck-when-you-want”.'
The Patrician played with it for a while.
'What's the glue made of?'
'Boiled slugs.'
The Patrician pulled the paper off one hand. It stuck to the other hand.
'Is that what you came to see me about?' said Leonard.
'No. I came to talk to you,' said Lord Vetinari, 'about the gonne.'
'Oh, dear. I'm very sorry.'
'I am afraid it has . . . escaped.'
'My goodness. I thought you said you'd done away with it.'
'I gave it to the Assassins to destroy. After all, they pride themselves on the artistic quality of their work. They should be horrified at the idea of anyone having that sort of power. But the damn fools did not destroy it. They thought they could lock it away. And now they've lost it.'
'They didn't destroy it?'
'Apparently not, the fools.'
And nor did you. I wonder why?'
'1 . . . do you know, I don't know?'
'I should never have made it. It was merely an application of principles. Ballistics, you know. Simple aerodynamics. Chemical power. Some rather good alloying, although I say it myself. And I'm rather proud of the rifling idea. I had to make a quite complicated tool for that, you know. Milk? Sugar?'
'No, thank you.'
'People are searching for it, I trust?'
'The Assassins are. But they won't find it. They don't think the right way.' The Patrician picked up a pile of sketches of the human skeleton. They were extremely good.
'Oh, dear.'
'So I am relying on the Watch.'
'This would be the Captain Vimes you have spoken of.'
Lord Vetinari always enjoyed his occasional conversations with Leonard. The man always referred to the city as if it was another world.
'Yes.'
'I hope you have impressed upon him the importance of the task.'
'In a way. I've absolutely forbidden him to undertake it. Twice.'
Leonard nodded. 'Ah. I . . . think I understand. I hope it works.'
He sighed.
'I suppose I should have dismantled it, but . . . it was so clearly a made thing. I had this strange fancy I was merely assembling something that already existed. Sometimes I wonder where I got the whole idea. It seemed . . . I don't know . . . sacrilege, I suppose, to dismantle it. It'd be like dismantling a person. Biscuit?'
'Dismantling a person is sometimes necessary,' said Lord Vetinari.
'This, of course, is a point of view,' said Leonard da Quirm politely.
'You mentioned sacrilege,' said Lord Vetinari. 'Normally that involves gods of some sort, does it not?'
'Did I use the word? I can't imagine there is a god of gonnes.'
'It is quite hard, yes.'
The Patrician shifted uneasily, reached down behind him, and pulled out an object.
'What,' he said, 'is this?'
'Oh, I wondered where that had gone,' said Leonard. 'It's a model of my spinning-up-into-the-air machine.'[20]
Lord Vetinari prodded the little rotor.
'Would it work?'
'Oh, yes,' said Leonard. He sighed. 'If you can find one man with the strength of ten men who can turn the handle at about one thousand revolutions a minute.'
The Patrician relaxed, in a way which only then drew gentle attention to the foregoing moment of tension.
'Now there is in this city,' he said, 'a man with a gonne. He has used it successfully once, and almost succeeded a second time. Could anyone have invented the gonne?'
'No,' said Leonard. 'I am a genius.' He said it quite simply. It was a statement of fact.
'Understood. But once a gonne has been invented, Leonard, how much of a genius need someone be to make the second one?'
'The rifling technique requires considerable finesse, and the cocking mechanism that slides the bullette assembly is finely balanced, and of course the end of the barrel must be very . . .' Leonard saw the Patrician's expression, and shrugged. 'He must be a clever man,' he said.
'This city is full of clever men,' said the Patrician. 'And dwarfs. Clever men and dwarfs who tinker with things.'
'I am so very sorry.'
'They never think.'
'Indeed.'
Lord Vetinari leaned back and stared at the skylight.
'They do things like open the Three Jolly Luck Take-Away Fish Bar on the site of the old temple in Dagon Street on the night of the Winter solstice when it also happens to be a full moon.'
'That's people for you, I'm afraid.'
'I never did find out what happened to Mr Hong.'
'Poor fellow.'
'And then there's the wizards. Tinker, tinker, tinker. Never think twice before grabbing a thread of the fabric of reality and giving it a pull.'
'Shocking.'
'The alchemists? Their idea of civic duty is mixing up things to see what happens.'
'I hear the bangs, even here.'
'And then, of course, along comes someone like you—'
'I really am terribly sorry.'
Lord Vetinari turned the model flying machine over and over in his fingers.
'You dream of flying,' he said.
'Oh, yes. Then men would be truly free. From the air, there are no boundaries. There could be no more war, because the sky is endless. How happy we would be, if we could but fly.'
Vetinari turned the machine over and over in his hands.
'Yes,' he said, 'I daresay we would.'
'I had tried clockwork, you know.'
'I'm sorry? I was thinking about something else.'
'I meant clockwork to power my flying machine. But it won't work.'
'Oh.'
'There's a limit to the power of a spring, no matter how tightly one winds it.'
'Oh, yes. Yes. And you hope that if you wind a spring one way, all its energies will unwind the other way. And sometimes you have to wind the spring as tight as it will go,' said Vetinari, 'and pray it doesn't break.'
His expression changed.
'Oh dear,' he said.
'Pardon?' said Leonard.
'He didn't thump the wall. I may have gone too far.'
Detritus sat and steamed. Now he felt hungry – not for food, but for things to think about. As the temperature sank, the efficiency of his brain increased even more. It needed something to do.
He calculated the number of bricks in the wall, first in twos and then in tens and finally in sixteens. The numbers formed up and marched past his brain in terrified obedience. Division and multiplication were discovered. Algebra was invented and provided an interesting diversion for a minute or two. And then he felt the fog of numbers drift away, and looked up and saw the sparkling, distant mountains of calculus.
Trolls evolved in high, rocky and above all in cold places. Their silicon brains were used to operating at low temperatures. But down on the muggy plains the heat build-up slowed them down and made them dull. It wasn't that only stupid trolls came down to the city. Trolls who decided to come down to the city were often quite smart – but they became stupid.