When Trot and Cap'n Bill entered the Rose Chamber they found the two mermaids reclining before an air fountain that was sending thousands of tiny bubbles up through the water.  
"These fountains of air are excellent things," remarked Queen Aquareine, "for they keep the water fresh and sweet, and that is the more necessary when it is confined by walls, as it is in this castle. But now, let us counsel together and decide what to do in the emergency that confronts us."
 
"How can we tell what to do without knowing what's going to happen?" asked Trot.
 
"Somethin's sure to happen," said Cap'n Bill.
 
As if to prove his words, a gong suddenly sounded at their door and in walked a fat little man clothed all in white, including a white apron and white cap. His face was round and jolly, and he had a big mustache that curled up at the ends.
 
"Well, well!" said the little man, spreading out his legs and putting his hands on his hips as he stood looking at them. "Of all the queer things in the sea, you're the queerest! Mermaids, eh?"
 
"Don't bunch us that way!" protested Cap'n Bill.
 
"You are quite wrong," said Trot. "I'm a—a girl."
 
"With a fish's tail?" he asked, laughing at her.
 
"That's only just for a while," she said, "while I'm in the water, you know. When I'm at home on the land I walk just as you do, an' so does Cap'n Bill."
 
"But we haven't any gills," remarked the Cap'n, looking closely at the little man's throat, "so I take it we're not as fishy as some others."
 
"If you mean me, I must admit you are right," said the little man, twisting his mustache. "I'm as near a fish as a man can be. But you see, Cap'n, without the gills that make me a fish, I could not live under water."
 
"When it comes to that, you've no business to live under water," asserted the sailor. "But I s'pose you're a slave and can't help it."
 
"I'm chief cook for that old horror Zog. And that reminds me, good mermaids, or good people, or good girls and sailors, or whatever you are, that I'm sent here to ask what you'd like to eat."
 
"Good to see you, sir," said Cap'n Bill. "I'm nearly starved, myself."
 
"I had it in mind," said the little man, "to prepare a regular mermaid dinner, but since you're not mermaids—"
 
"Oh, two of us are," said the Queen, smiling. "I, my good cook, am Aquareine, the ruler of the mermaids, and this is the Princess Clia."
 
"I've often heard of you, your Majesty," returned the chief cook, bowing respectfully, "and I must say I've heard only good of you. Now that you have unfortunately become my master's prisoners, it will give me pleasure to serve you as well as I am able."
 
"We thank you, good sir," said Aquareine.
 
"What have you got to eat?" inquired Trot. "Seems to me I'm hollow way down to my toes—my tail, I mean—and it'll take a lot to fill me up. We haven't eaten a morsel since breakfast, you know."
 
"I think I shall be able to give you almost anything you would like," said the cook. "Zog is a wonderful magician and can procure anything that exists with no more effort than a wiggle of his thumb. But some eatables, you know, are hard to serve under water, because they get so damp that they are soon ruined."
 
"Ah, it is different with the mermaids," said Princess Clia.
 
"Yes, all your things are kept dry because they are surrounded by air. I've heard how the mermaids live. But here it is different."
 
"Take this ring," said the Queen, handing the chief cook a circlet which she drew from her finger. "While it is in your possession, the food you prepare will not get wet, or even moist."
 
"I thank your Majesty," returned the cook, taking the ring. "My name is Tom Atto, and I'll do my best to please you. How would you like for luncheon some oysters on the half-shell, clam broth, shrimp salad, broiled turtle steak and watermelon?"
 
"That will do very nicely," answered the Queen.
 
"Do watermelons grow in the sea?" asked Trot.
 
"Of course, that is why they are called watermelons," replied Tom Atto. "I think I shall serve you a water ice, in addition to the rest. Water ice is an appropriate sea food."
 
"Have some watercress with the salad," said Cap'n Bill.
 
"I'd thought of that," declared the cook. "Doesn't my bill of fare make your mouths water?"
 
"Hurry up and get it ready," suggested Trot.
 
Tom Atto at once bowed and retired, and when they were done, Cap'n Bill said to the queen, "Do you think, ma'am, we can manage to escape from Zog and his castle?"
 
"I hope we shall find a way," replied Aquareine. "The evil powers of magic which Zog controls may not prove to be as strong as the fairy powers I possess, but of course I cannot be positive until I discover what this wicked magician is able to do."
 
Princess Clia was looking out of one of the windows. "I think I can see an opening far up in the top of the dome," she said. They all hastened to the windows to look, and although Trot and Cap'n Bill could see nothing but a solid dome above the castle—perhaps because it was so far away from them—the sharp eyes of Aquareine were not to be deceived.
 
"Yes," she announced, "there is surely an opening in the center of the great dome. A little thought must convince us that such an opening is bound to exist, for otherwise the water confined within the dome would not be fresh or clear."
 
"Then if we could escape from this castle, we could swim up to the hole in the dome and get free!" exclaimed Trot.
 
"Why, Zog has probably ordered the opening well guarded, as he has all the other outlets," responded the Queen. "Yet it may be worth while for us to make the attempt to get back into the broad ocean this way. The night would be the best time, when all are asleep, and surely it will be quicker to reach the ocean through this hole in the roof than by means of the long, winding passages by which we entered."
 
"But we will have to break out of the castle in some way," observed Cap'n Bill.
 
"That will not be difficult," answered Aquareine. "It will be no trouble for me to shatter one of these panes of glass, allowing us to pass out and swim straight up to the top of the dome."
 
"Let's do it now!" said Trot eagerly.
 
"No, my dear, we must wait for a good opportunity when we are not watched closely. We do not wish the terrible Zog to thwart our plan," answered the Queen gently.
 
Presently two sailor boys entered bearing trays of food, which they placed upon a large table. They were cheery-faced young fellows with gills at their throats, but had laughing eyes, and Trot was astonished not to............