'What, one scratch for "yes", one for "no"? That sort of thing?'

The kangaroo scratched an ear, and then remembered itself. 'Yep,' it said. It wrinkled its nose.

'And that wrinkling?' said Rincewind.

'Oh, that means "Come quick, someone's fallen down a deep hole," ' said the kangaroo.

'That one gets used a lot?'

'You'd be amazed.'

'And... what's kangaroo for "You are needed for a quest of the utmost importance"?' said Rincewind, with guileful innocence.

'You know, it's funny you should ask that—'

The sandals barely moved. Rincewind rose from them like a man leaving the starting blocks, and when he landed his feet were already making running movements in the air.

After a while the kangaroo came alongside and accompanied him in a series of easy bounds.

'Why are you running away without even listening to what I have to say?'

'I've had long experience of being me,' panted Rincewind. 'I know what's going to happen. I'm going to be dragged into things that shouldn't concern me. And you're just a hallucination caused by rich food on an empty stomach, so don't you try to stop me!'

'Stop you?' said the kangaroo. 'When you're heading in the right direction?'

Rincewind tried to slow down, but his method of running was very efficiently based on the idea that stopping was the last thing he'd do. Legs still moving, he ran out over the empty air and plunged into the void.

The kangaroo looked down and, with a certain amount of satisfaction, wrinkled its nose.

'Archchancellor!'

Ridcully awoke, and sat up. The Lecturer in Recent Runes was hurrying up, out of breath.

The Bursar and I went for a walk along the beach,' he said. 'And can you guess where we ended up?'

'In Kiddling Street, Quirm,' said Ridcully tartly, brushing an exploring beetle off his beard. 'That little bit by the teashop, with the trees in it.'

That's astonishing, Archchancellor. Because, you know, in fact, we didn't. We wound up back here. We're on a tiny island. Were you having a rest?'

'A few moments' cogitating,' said Ridcully. 'Any idea where we are yet, Mister Stibbons?'

Ponder looked up from his notebook. 'I won't be able to work that out precisely until sundown, sir. But I think we're pretty close to the Rim.'

'And I think we found where the Professor of Cruel and Unusual Geography has been camping, said the Lecturer in Recent Runes. He rummaged in a deep pocket. There was a camp, and a fireplace. Bamboo furniture and whatnot. Socks on a washing line. And this.'

He pulled out the remains of a small notebook. It was standard UU issue. Ridcully would never let anyone have a new one until they'd filled up every page on both sides.

'It was just lying there,' said the Lecturer in Recent Runes. 'I'm afraid ants have been eating it.'

Ridcully flicked it open and read the first page. ' "Some interesting observations on Mono Island," ' he said. ' "A most singular place." '

He flicked through the rest of the book. 'Just a list of plants and fishes,' he said. 'Doesn't look all that special to me, but then I ain't a geography man. Why's he callin' it Mono Island?'

'It means One Island,' said Ponder.

'Well, you've just told me it is one island,' said Ridcully. 'Anyway, I can see several more out there. Severe lack of imagination, I suggest.' He tucked the notebook into his robe. 'Right, then. No sign of the chap himself?'

'Strangely, no.'

'Probably went swimming and was eaten by a pineapple,' said Ridcully. 'How's the Librarian doing, Mister Stibbons? Comfortable, is he?'

'You should know, sir,' said Ponder. 'You've been sitting on him for three-quarters of an hour.'

Ridcully looked down at the deckchair. It was covered with red fur. 'This is—?'

'Yes, sir.'

'I thought perhaps our geography man had brought it with him.'

'Not, er, with the black toenails, sir.'

Ridcully peered further. 'Should I get up, do you think?'

'Well, he is a deckchair, sir. So being sat on is a perfectly normal activity for him, I suppose.'

'We must find a cure, Stibbons. This is too strange—'

'Coo-ee, gentlemen!'

There was activity in front of the window. It centred around a vision in pink, although admittedly the sort of vision associated with the more erratic kind of hallucinogen.

In theory there is no dignified way for a lady of a certain age to climb through a window, but nevertheless this one was attempting it. In fact she moved with more than dignity, which is something that is given away free with kings and bishops; what she had was respectability, which is home-made out of cast iron. However, at some point she would have to show a bit of ankle, and she was wedged awkwardly on the sill while trying to prevent this from happening.

The Senior Wrangler coughed. If he had been wearing a tie he would have straightened it.

'Ah,' said Ridcully. 'The inestimable Mrs Whitlow. Someone go and give her a hand, Stibbons.'

'I'll help,' said the Senior Wrangler, just a little faster than he meant.

The University's housekeeper turned and spoke to someone unseen beyond the window and then turned back, her shouting-at-subordinates expression briefly visible before i: was eclipsed by her much sunnier talking-to-wiz-ards one.

The Chair of Indefinite Studies had once upset the Senior Wrangler by saying that the housekeeper had a face full of chins, but there was a glossiness about her that put some people in mind of a candle that had been kept in the warm for too long. There wasn't anything approaching a straight line anywhere on Mrs Whitlow, until she found that something hadn't been dusted properly, when you could use her lips as a ruler.

Most of the Faculty walked in dread of her. She had strange powers that they couldn't quite get a grip on, like the ability to get the beds made and the windows washed. A wizard who could wield a staff crackling with power against dreadful monsters from some ghastly region was nevertheless quite capable of picking up a feather duster by the wrong end and seriously injuring himself with it. At Mrs Whitlow's whim people's clothes got washed and socks got darned. If anyone annoyed her, they found their study spring-cleaned more often than was good for them, and since to a wizard his room is as personal an item as his trouser pockets this was a terrible vengeance.

'Ai just thought you gentlemen would like a morning snack,' she said, as the wizards helped her down. 'So Ai took the liberty of getting the gels to put together a cold collation. Ai'll just go and fetch it...'

The Archchancellor stood up hastily. 'Well done, Mrs Whitlow.'

'Er... a morning snack?' said the Senior Wrangler. 'It looks like mid-afternoon to me...' His tone made it clear that if Mrs Whitlow wanted it to be the morning, he wasn't going to cause any trouble.

'Speed of light crossing the Disc,' said Ponder. 'We are close to the Rim, I'm sure. I'm trying to remember how you tell the time by looking at the sun.'

'I should leave it for a while,' said the Senior Wrangler, squinting under his hand. 'It's too bright to see the numbers at the moment.'

Ridcully nodded happily. I'm sure we could all do with a snack,' he said. 'Something suitable for the beach, perhaps.'

'Cold pork and mustard,' said the Dean, waking up.

'Possibly some beer,' said the Senior Wrangler.

'And have we got any of those pies, you know, the ones with the egg inside them?' said the Lecturer in Recent Runes. 'Although I must say I've always thought that it was rather cruel to the chicken—'

There was a soft little sound, very similar to the one you get, aged around seven, when you stick your finger in your mouth and flick it out again quickly and think it is incredibly funny.