There were plenty of these children to choose from, at any rate. The old mer-king had hundreds of daughters and thousands of grandchildren, and all in the same palace; and they were all fond of the two Rovers, and so was Mrs Artaxerxes. It was a pity that Roverandom never thought of telling her his story; she knew how to manage the PAM in any mood. But in that case, of course, Roverandom would have gone back sooner and missed many of the sights. It was with Mrs Artaxerxes, and some of the mer-children that he visited the Great White Caves, where all the jewels that are lost in the sea, and many that have always been in the sea, and of course pearls upon pearls, are hoarded and hidden.

They went too, another time, to visit the smaller sea-fairies in their little glass houses at the bottom of the sea. The sea-fairies seldom swim, but wander singing over the bed of the sea in smooth places, or drive in shell-carriages harnessed to the tiniest fishes; or else they ride astride little green crabs with bridles of fine threads (which of course don't prevent the crabs from going sideways, as they always will); and they have troubles with the sea-goblins that are larger, and ugly and rowdy, and do nothing except fight and hunt fish and gallop about on sea-horses. Those goblins can live out of the water for a long while, and play in the surf at the water's edge in a storm. So can some of the sea-fairies, but they prefer the calm warm nights of summer evenings on lonely shores (and naturally are very seldom seen in consequence).

Another day old Uin turned up again and gave the two dogs a ride for a change; it was like riding on a moving mountain. They were away for days and days; and they only turned back from the eastern edge of the world just in time. There the whale rose to the top and blew out a fountain of water so high that a lot of it was thrown right off the world and over the edge.

Another time he took them to the other side (or as near as he dared), and that was a still longer and more exciting journey, the most marvellous of all Roverandom's travels, as he realised later, when he was grown to be an older and a wiser dog. It would take the whole of another story, at least, to tell you of all their adventures in Uncharted Waters and of their glimpses of lands unknown to geography, before they passed the Shadowy Seas and reached the great Bay of Fairyland (as we call it) beyond the Magic Isles; and saw far off in the last West the Mountains of Elvenhome and it be light of Faery upon the waves. Roverandom thought he caught a glimpse of the city of the Elves on the green hill beneath the Mountains, a glint of white far away; but Uin dived again so suddenly that he could not be sure. If he was right, he is one of the very few creatures, on two legs or four, who can walk about our own lands and say they have glimpsed that other land, however far away.

'I should catch it, if this was found out!' said Uin. 'No one from the Outer Lands is supposed ever to come here; and few ever do now. Mum's the word! '

What did I say about dogs? They don't forget ill-tempered lumps of rock. Well then, in spite of all these varied sight-seeings and these astonishing journeys, Roverandom kept it in his underneath mind all the time. And it came back into his upper mind, as soon as ever he got back home.

His very first thought was: 'Where's that old wizard? What's the use of being polite to him! I'll spoil his trousers again, if I get half a chance.'

He was in that frame of mind when, after trying in vain to have a word alone with Artaxerxes, he saw the magician go by, down one of the royal roads leading from the palace. He was of course too proud at his age to grow a tail or fins or learn to swim properly. The only thing he did like a fish was to drink (even in the sea, so he must have been thirsty);he spent a lot of time that might have been employed on official business conjuring up cider into large barrels in his private apartments. When he wanted to get about quickly, he drove. When Roverandom saw him, he was driving in his express — a gigantic shell shaped like a cockle and drawn by seven sharks. People got out of the way quick, for the sharks could bite.

'Let's follow!' said Roverandom to the mer-dog, and follow they did; and the two bad dogs dropped pieces of rock into the carriage whenever it passed under cliffs. They could nip along amazingly fast, as I told you; and they whizzed ahead, hid in weed-bushes and pushed anything loose they could find over the edge. It annoyed the wizard intensely, but they took care that he did not spot them.

Artaxerxes was in a very bad temper before he started, and he was in a rage before he had gone far, a rage not unmixed with anxiety. For he was going to investigate the damage done by an unusual whirlpool that had suddenly appeared — and in a part of the sea that he did not like at all; he thought (and he was quite right) that there were nasty things in that direction that were best left alone. I dare say you can guess what was the matter; Artaxerxes did. The ancient Sea-serpent was waking, or half thinking about it.

He had been in a sound sleep for years, but now he was turning. When he was uncoiled he would certainly have reached a hundred miles (some people say he would reach from Edge to Edge, but that is an exaggeration); and when he is curled up there is only one cave other than Pot (where he used to live, and many people wish him back there), only one cave in all the oceans that will hold him, and that is very unfortunately not a hundred miles from the mer-king's palace.

When he undid a curl or two in his sleep, the water heaved and shook and bent people's houses and spoilt their repose for miles and miles around. But it was very stupid to send the PAM to look into it; for of course the Sea-serpent is much too enormous and strong and old and idiotic for any one to control (primordial, prehistoric, autothalassic, fabulous, mythical, and silly are other adjectives applied to him); and Artaxerxes knew it all only too well.

Not even the Man-in-the-Moon working hard for fifty years could have concocted a spell large enough or long enough or strong enough to bind him. Only once had the Man-in-the-Moon tried (when specially requested), and at least one continent fell into the sea as a result.

Poor old Artaxerxes drove straight up to the mouth of the Sea-serpent's cave. But he had no sooner got out of his carriage than he saw the tip of the Sea-serpent's tail sticking out of the entrance; larger it was than a row of gigantic water-barrels, and green and slimy. That was quite enough for him. He wanted to go home at once before the Worm turned again — as all worms will at odd and unexpected moments.

It was little Roverandom that upset everything! He did not know anything about the Sea-serpent or its tremendousness; all he thought about was baiting the ill-tempered wizard. So when a chance came — Artaxerxes was standing staring stupid-like at the visible end of the serpent, and his steeds were taking no particular notice of anything — he crept up and bit one of the sharks' tails, for fun. For fun! What fun! The shark jumped straight forward, and the carriage jumped forward too; and Artaxerxes, who had just turned too and to get into it, fell on his back. Then the shark bit the only thing it could reach at the moment, which was the shark in front; and that shark bit the next one; and so on, until the last of the seven, seeing nothing else to bite — bless me! the idiot, if he did not go and bite the Sea-serpent's tail!

The Sea-serpent gave a new and very unexpected turn! And the next thing the dogs knew was being whirled all over the place in water gone mad, bumping into giddy fishes and spinning sea-trees, scared out of their lives in a cloud of uprooted weeds, sand, shells, slugs, periwinkles, and oddments. And things got worse and worse, and the serpent kept on turning. And there was old Artaxerxes, clinging on to the reins of the sharks, being whirled all over the place too, and saying the most dreadful things to them. To the sharks, I mean. Luckily for this story, he never knew what Roverandom had done.