The room in the enchanted castle which Zog called the "den" and in which the wicked sea monster passed most of his time was a perfectly shaped dome of solid gold. The upper part of this dome was thickly set with precious jewels—diamonds, rubies, sapphires and emeralds, which sparkled beautifully through the crystal water. The lower walls were as thickly studded with pearls, all being of perfect shape and color. Many of the pearls were larger than any which may be found upon earth, for the sea people knew where to find the very best and hide them away where men cannot discover them.  
The golden floor was engraved with designs of rare beauty, depicting not only sea life, but many adventures upon land. In the room were several large, golden cabinets, the doors of which were closed and locked, and in addition to the cabinets there were tables, chairs and sofas, the latter upholstered with softest sealskins. Handsome rugs of exquisitely woven seaweeds were scattered about, the colors of which were artistically blended together. In one corner a fountain of air bubbled up through the water. The entire room was lighted as brilliantly as if exposed to the direct rays of the sun, yet where this light came from our friends could not imagine. No lamp or other similar device was visible anywhere.
 
The strangers at first scarcely glanced at all these beautiful things, for in an easy chair sat Zog himself, more wonderful than any other living creature, and as they gazed upon him, their eyes seemed fascinated as if held by a spell. Zog's face was the face of a man, except that the tops of his ears were pointed like horns and he had small horns instead of eyebrows and a horn on the end of his chin. In spite of these deformities, the expression of the face was not unpleasant or repulsive. His hair was carefully parted and brushed, and his mouth and nose were not only perfect in shape but quite handsome.
 
Only the eyes betrayed Zog and made him terrible to all beholders. They seemed like coals of glowing fire and sparkled so fiercely that no one ever cared to meet their gaze for more than an instant. Perhaps the monster realized this, for he usually drooped his long lashes over his fiery eyes to shut out their glare. Zog had two well-shaped legs which ended in the hoofs of beasts instead of feet, and these hoofs were shod with gold. His body was a shapeless mass covered with richly embroidered raiment, over which a great robe of cloth of gold fell in many folds. This robe was intended to hide the magician's body from view, but Trot noticed that the cloth moved constantly in little ripples, as if what lay underneath would not keep still.
 
The best features of which Zog could boast were his arms and hands, the latter being as well formed, as delicate and white as those of a well-bred woman. When he spoke, his voice sounded sweet and clear, and its tones were very gentle. He had given them a few moments to stare at him, for he was examining them in turn with considerable curiosity. "Well," said he, "do you not find me the most hateful creature you have ever beheld?"
 
The queen refrained from answering, but Trot said promptly, "We do. Nothing could be more horrider or more disgustin' than you are, it seems to me."
 
"Very good, very good indeed," declared the monster, lifting his lashes to flash his glowing eyes upon them. Then he turned toward Cap'n Bill. "Man-fish," he continued, "what do YOU think of me?"
 
"Mighty little," the sailor replied. "You orter be 'shamed to ask sech a question, knowin' you look worse ner the devil himself."
 
"Very true," answered Zog, frowning. He felt that he had received a high compliment, and the frown showed he was pleased with Cap'n Bill.
 
But now Queen Aquareine advanced to a position in front of their captor and said, "Tell me, Zog, why have you trapped us and brought us here?"
 
"To destroy you," was the quick answer, and the magician turned for an instant to flash his eyes upon the beautiful mermaid. "For two hundred years I have been awaiting a chance to get within my power some friend of Anko the Sea Serpent—of Anko, whom I hate!" he added, smiling sweetly. "When you left your palace today, my swift spies warned me, and so I sent the sea devils to capture you. Often have they tried to do this before, but always failed. Today, acting by my command, they tricked you, and by surrounding you forced you to the entrance of my enchanted castle. The result is a fine capture of important personages. I have now in my power the queen and princess of the fairy mermaids, as well as two wandering earth people, and I assure you I shall take great pleasure in destroying you utterly."
 
"You are a coward," declared the Queen proudly. "You dared not meet us in the open sea."
 
"No, I dare not leave this castle," Zog admitted, still smiling. "But here in my own domain my power is supreme. Nothing can interfere with my vengeance."
 
"That remains to be seen," said Aquareine, firmly meeting the gaze of the terrible eyes.
 
"Of course," he answered, nodding his head with a graceful movement. "You will try to thwart me and escape. You will pit your fairy power against my powers of magic. That will give me great pleasure, for the more you struggle, the greater will be my revenge."
 
"But why should you seek revenge upon us?" asked Clia. "We have never harmed you."
 
"That is true," replied Zog. "I bear you no personal ill will. But you are friends of my great enemy, King Anko, and it will annoy him very much when he finds that you have been destroyed by me. I cannot hurt the rascally old sea serpent himself, but through you I can make him feel my vengeance."
 
"The mermaids have existed thousands of years," said the Queen in a tone of pride. "Do you imagine the despised and conquered Zog has power to destroy them?"
 
"I do not know," was the quiet answer. "It will be interesting to discover which is the more powerful."
 
"I challenge you to begin the test at once, vile magician!" exclaimed Aquareine.
 
"There is no hurry, fair Queen," answered Zog in his softest tones. "I have been so many years in accomplishing your capture that it is foolish to act hastily now. Besides, I am lonely. Here in my forced retirement I see only those uninteresting earth mortals whom I have made my slaves, for all sea dwellers are forbidden to serve me save the sea devils, and they dare not enter my castle. I have saved many mortals from drowning and brought them here to people my castle, but I do not love mortals. Two lovely mermaids are much more interesting, and before I allow you to perish, I shall have much amusement in witnessing your despair and your struggles to escape. You are now my prisoners. By slow degrees I shall wear out your fairy powers and break your hearts, as well as the hearts of these earth dwellers who have no magic powers, and I think it will be a long time before I finally permit you to die."
 
"That's all right," said Trot cheerfully. "The longer you take, the better I'll be satisfied."
 
"That's how I feel about it," added Cap'n Bill. "Don't get in a hurry to kill us Zog. It'll be such a wear an' tear on your nerves. Jes' take it easy an' let us live as long as we can."
 
"Don't you care to die?" asked the ma............