Glinda the Good, having decided to try her sorcery upon the abandoned submarine, so that it would obey her commands, asked all of her party, including the Skeezers, to withdraw from the shore of the lake to the line of palm trees. She kept with her only the little Wizard of Oz, who was her pupil and knew how to assist her in her magic rites. When they two were alone beside the stranded boat, Glinda said to the Wizard:  
"I shall first try my magic recipe No. 1163, which is intended to make inanimate objects move at my command. Have you a skeropythrope with you?"
 
"Yes, I always carry one in my bag," replied the Wizard. He opened his black bag of magic tools and took out a brightly polished skeropythrope, which he handed to the Sorceress. Glinda had also brought a small wicker bag, containing various requirements of sorcery, and from this she took a parcel of powder and a vial of liquid. She poured the liquid into the skeropythrope and added the powder. At once the skeropythrope began to sputter and emit sparks of a violet color, which spread in all directions. The Sorceress instantly stepped into the middle of the boat and held the instrument so that the sparks fell all around her and covered every bit of the blackened steel boat. At the same time Glinda crooned a weird incantation in the language of sorcery, her voice sounding low and musical.
 
After a little the violet sparks ceased, and those that had fallen upon the boat had disappeared and left no mark upon its surface. The ceremony was ended and Glinda returned the skeropythrope to the Wizard, who put it away in his black bag.
 
"That ought to do the business all right," he said confidently.
 
"Let us make a trial and see," she replied.
 
So they both entered the boat and seated themselves.
 
Speaking in a tone of command the Sorceress said to the boat: "Carry us across the lake, to the farther shore."
 
At once the boat backed off the sandy beach, turned its prow and moved swiftly over the water.
 
"Very good—very good indeed!" cried the Wizard, when the boat slowed up at the shore opposite from that whence they had departed. "Even Coo-ee-oh, with all her witchcraft, could do no better."
 
The Sorceress now said to the boat:
 
"Close up, submerge and carry us to the basement door of the sunken island—the door from which you emerged at the command of Queen Coo-ee-oh."
 
The boat obeyed. As it sank into the water the top sections rose from the sides and joined together over the heads of Glinda and the Wizard, who were thus enclosed in a water-proof chamber. There were four glass windows in this covering, one on each side and one on either end, so that the passengers could see exactly where they were going. Moving under water more slowly than on the surface, the submarine gradually approached the island and halted with its bow pressed against the huge marble door in the basement under the Dome. This door was tightly closed and it was evident to both Glinda and the Wizard that it would not open to admit the underwater boat unless a magic word was spoken by them or someone from within the basement of the island. But what was this magic word? Neither of them knew.
 
"I'm afraid," said the Wizard regretfully, "that we can't get in, after all. Unless your sorcery can discover the word to open the marble door."
 
"That is probably some word only known to Coo-ce-oh," replied the Sorceress. "I may be able to discover what it is, but that will require time. Let us go back again to our companions."
 
"It seems a shame, after we have made the boat obey us, to be balked by just a marble door," grumbled the Wizard.
 
At Glinda's command the boat rose until it was on a level with the glass dome that covered the Skeezer village, when the Sorceress made it slowly circle all around the Great Dome.
 
Many faces were pressed against the glass from the inside, eagerly watching the submarine, and in one place were Dorothy and Ozma, who quickly recognized Glinda and the Wizard through the glass windows of the boat. Glinda saw them, too, and held the boat close to the Dome while the friends exchanged greetings in pantomime. Their voices, unfortunately, could not be heard through the Dome and the water and the side of the boat. The Wizard tried to make the girls understand, through signs, that he and Glinda had come to their rescue, and Ozma and Dorothy understood this from the very fact that the Sorceress and the Wizard had appeared. The two girl prisoners were smiling and in safety, and knowing this Glinda felt she could take all the time necessary in order to effect their final rescue.
 
As nothing more could be done just then, Glinda ordered the boat to return to shore and it obeyed readily. First it ascended to the surface of the water, then the roof parted and fell into the slots at the side of the boat, and then the magic craft quickly made the shore and beached itself on the sands at the very spot from which it had departed at Glinda's command. All the Oz people and the Skeezers at once ran to the boat to ask if they had reached the island, and whether they had seen Ozma and Dorothy. The Wizard told them of the obstacle they had met in the way of a marb............