The Librarian was saying 'ook ook' to himself under his breath, in the same way that a slightly distracted person searches aimlessly around the room saying 'scissors, scissors' in the hope that this will cause them to re-materialize. In fact he was saying 'evolution, evolution'. He'd been sent to find a good book on it.
He had a very complicated reference card in his mouth. The wizards of UU knew all about evolution. It was a self-evident fact. You took some wolves, and by careful unnatural selection over the generations you got dogs of all shapes and sizes. You took some sour crab-apple trees and, by means of a stepladder, a fine paintbrush and a lot of patience, you got huge juicy apples. You took some rather scruffy desert horses and, with effort and a good stock book, you got a winner. Evolution was a demonstration of narrativium in action. Things improved. Even the human race was evolving, by means of education and other benefits of civilization; it had began with rather bad-mannered people in caves, and it had now produced the Faculty of Unseen University, beyond which it was probably impossible to evolve further.
Of course, there were people who occasionally advanced more radical ideas, but they were like the people who thought the world really mas round or that aliens were interested in the contents of their underwear.
Unnatural selection was a fact, but the wizards knew, they knew, that you couldn't start off with bananas and get fish.
The Librarian glanced at the card, and took a few surprising turnings. There was the occasional burst of noise on the other side of the shelves, rapidly changing as though someone was playing with handfuls of sound, and a flickering in the air. Someone talking was replaced with the absorbent silence of empty rooms was replaced with the crackling of flame and displaced by laughter ...
Eventually, after much walking and climbing, the Librarian was faced with a blank wall of books. He stepped up to them with librarianic confidence and they melted away in front of him.
He was in some sort of study. It was book-lined, although with rather fewer than the Librarian would have expected to find in such an important node of L-space. Perhaps there was just the one book ... and there it was, giving out L-radiation at a strength the Librarian had seldom encountered outside the seriously magical books in the locked cellars of Unseen University. It was a book and father of books, the progenitor of a whole race that would flutter down the centuries ...
It was also, unfortunately, still being written.
The author, pen still in hand, was staring at the Librarian as if he'd seen a ghost.
With the exception of his bald head and a beard that even a wizard would envy, he looked very, very much like the Librarian.
'My goodness ...'
'Ook?' The Librarian had not expected to be seen. The writer must have something very pertinent on his mind.
'What manner of shade are you ... ?'
'Ook.'
A hand reached out, tremulously. Feeling that something was expected of him, the Librarian reached out as well, and the tips of the fingers touched.
The author blinked.
'Tell me, then,' he said, 'is Man an ape, or is he an angel?'
The Librarian knew this one.
'Ook,' he said, which meant: ape is best, because you don't have to fly and you're allowed sex, unless you work at Unseen University, worst luck.
Then he backed away hurriedly, ooking apologetic noises about the minor error in the spacetime coordinates, and knuckled off through the interstices of L-space and grabbed the first book he found that had the word 'Evolution' in the title.
The bearded man went on to write an even more amazing book. If only he had thought to use the word 'Ascent' there might not have been all that unpleasantness.
But, there again, perhaps not.
HEX let itself absorb more of the future ... call it ... knowledge. Words were so difficult. Everything was context. There was too much to learn. It was like trying to understand a giant machine when you didn't understand a screwdriver.
Sometimes HEX thought it was picking up fragmentary instructions. And, further away, much further away, there were little disjointed phrases in the soup of concepts which made sense but did not seem to be sensible. Some of them arrived unbidden.
Even as HEX pondered this, another one arrived and offered an opportunity to make $$$$ While You Sit On Your Butt!!!!! He considered this unlikely.
The title brought back by the Librarian was The Young Person's Guide to Evolution.
The Archchancellor turned the pages carefully. They were well illustrated. The Librarian knew his wizards.
'And this is a good book on evolution?' said the Archchancellor.
'Ook.'
'Well, it makes no sense to me,' said the Archchancellor. 'I mean t'say, what the hell is this picture all about?'
It showed, on the left, a rather hunched-up, ape-like figure. As it crossed the page, it gradually arose and grew considerably less hairy until it was striding confidently towards the edge of the page, perhaps pleased that it had essayed this perilous journey without at any time showing its genitals.
'Looks like me when I'm getting up in the mornings,' said the Dean, who was reading over his shoulder.
'Where'd the hair go?' Ridcully demanded.
'Well, some people shave,' said the Dean.
'This is a very strange book,' said Ridcully, looking accusingly at the Librarian, who kept quiet because in fact he was a little worried. He rather suspected he might have altered history, or at least a history, and on his flight back to the safety of UU he'd seized the first book that looked as though it might be suitable for people with a very high IQ but a mental age of about ten. It had been in an empty byway, far off his usual planes of exploration, and there had been very small red chairs in it.
'Oh, I get it. This is a fairy story,' said Ridcully. 'Frogs turnin' into princes, that kind of thing. See here ... there's something like our blobs, and then these fishes, and then it's a ... a newt, and then it's a big dragony type of thing and, hah, then it's a mouse, then here's an ape, and then it's a man. This sort of thing happens all the time out in the really rural areas, you know, where some of the witches can be quite vindictive.'
'The Omnians believe something like this, you know,' said the Senior Wrangler. 'Om started off making simple things like snakes, they say, and worked his way up to Man.'
'As if life was like modelling clay?' said Ridcully, who was not a patient man with religion. 'You start out with simple things and then progress to elephants and birds which don't stand up properly when you put them down? We've met the God of Evolution, gentlemen ... remember? Natural evolution merely improves a species. It can't change anything.'
His finger stabbed at the next page in the brightly coloured book.
'Gentlemen, this is merely some sort of book of magic, possibly about the Morphic Bounce Hypothesis. Look at this.' The picture showed a very large lizard followed by a big red arrow, followed by a bird. 'Lizards don't turn into birds. If they did, why have we still got lizards? Things can't decide for themselves what shape they're going to be. Ain't that so, Bursar?'