"I can promise the utmost discretion," I said, "but I cannot promise to make you the greatest swordsman among the First Born; the achievement of that will depend somewhat upon your own native ability. I will instruct you, however."

"You do not talk much like a poor panthan," he said. "You speak to me much as would a man who had been accustomed to speaking with jeddaks- and as an equal."

"You may have much to learn about being a swordsman," I said, "but I have even more to learn about being a slave."

He grunted at that, and then arose and told me to follow him. We passed through a little door behind the desk at which he had been sitting, and down a ramp which led to the pits below the palace. At the foot of the ramp we entered a large, well-lighted room in which were filing cases, a couch, several benches, and a table strewn with writing materials and drawing instruments.

"This is a secret apartment," said Doxus. "Only one person other than myself has access to it. We shall not be disturbed here. This other man of whom I spoke is my most trusted servant. He may come in occasionally, but he will not divulge our little secret. Let us get to work. I can scarcely wait until the day that I shall cross swords with some of those egotistical nobles who think that they are really great swordsmen. Won't they be surprised!"

Now, I had no intention of revealing all of my tricks of swordsmanship to Doxus; although I might have as far as any danger to myself was concerned, for he could never equal me; because he could never match my strength or agility.

I had been practicing him in disarming an opponent, when a door opposite that from which we had entered the room opened; and a man came in. During the brief time that the door remained open, I saw beyond it a brilliantly lighted room; and caught a glimpse of what appeared to be an amazingly complicated machine.

Its face was covered with dials, buttons, and other gadgets-all reminiscent of the machine to which I had been attached during the weird examination I had received upon entry to the city.

At sight of me, the newcomer looked surprised. Here was I, a total stranger and evidently a slave, facing the Jeddak of the First Born with a naked blade in my hand. Instantly, the fellow whipped out a radium pistol; but Doxus forestalled a tragedy.

"It is all right, Myr-lo," he said. "I am just taking some instruction in the finer points of swordsmanship from this slave. His name is Dotar Sojat; you will see him down here with me daily. What are you doing down here now? Anything wrong?"

"A slave escaped last night," said Myr-lo.

"You got him, of course?"

"Just now. He was about half way up the escarpment, I think."

"Good!" said Doxus. "Resume, Dotar Sojat."

I was so full of what I had just heard and seen and what I thought that it all connoted that I had hard work keeping my mind on my work; so that I inadvertently let Doxus prick me. He was as pleased as Punch.

"Wonderful!" he exclaimed. "In one lesson I have been so improved that I have been able to touch you! Not even Nolat could do that. We will stop now. I give you the freedom of the city. Do not go beyond the gates." He went to the table and wrote for a minute; then he handed me what he had written. "Take this," he said; "it will permit you to go where you will in all public places and return to the palace."

He had written:

Dotar Sojat, the slave, is granted the freedom of the palace and the city.

Doxus,

Jeddak.

As I returned to my quarters, I determined to let Doxus prick me every day. I found Man-lat, the under-officer who had been detailed to look after me, alone in his room, which adjoined mine.

"Your duties are going to be lessened," I told him.

"What do you mean?" he asked.

I showed him the pass.

"Doxus must have taken a liking to you," he said. "I never knew before of a slave being given that much freedom, but don't try to escape."

"I know better than to try that. I saw the skeletons from the top to the bottom of the escarpment."

"We call them Myr-lo's babies," said Man-lat; "he's so proud of them."

"Who is Myr-lo?" I asked.

"Somebody you'll probably never see," replied Man-lat. "He sticks to his pots and his kettles, his lathes and drills and his drawing instruments."

"Does he live in the palace?" I asked.

"Nobody knows where he lives, unless it be the jeddak. They say he has a secret apartment in the palace, but I don't know about that. What I do know is that he's the most powerful man in Kamtol, next to Doxus; and that he has the power of life and death over every man and woman in the Valley of the First Born. Why, he could strike either one of us dead right while we are sitting here talking; and we'd never see what killed us."

I was even more convinced now than I had been before that I had found what I had hoped to in that secret room beneath the palace but how to utilize the knowledge!

I immediately took advantage of my freedom to go out into the city, only a part of which I had seen during the short time that I had been out with Ptang. The guards at the palace gate were as surprised when they read my pass as Man-lat had been. Of course, pass or no pass, I was still an enemy and a slave-a person to be viewed with suspicion and contempt; but in my case the contempt was tempered by the knowledge that I had bested their best at swordsmanship. I doubt that you can realize in what high esteem a great swordsman is held everywhere on Mars. In his own country he is worshipped, as might be a Juan Belmonte in Spain or a Jack Dempsey in America.

I had not gone far from the palace, when I chanced to look up; and, to my surprise, saw a number of fliers dropping down toward the city. The First Born I had seen in the Valley Dor had all been flying men; but I had not before seen any fliers over the valley, and I had wondered.

Martian aeroplanes, being lighter than air, or in effect so; because of the utilization of that marvellous discovery, the ray of repulsion, which tends to push them away from the planet, can land vertically in a space but little larger in area than themselves; and I saw that the planes I was watching were coming down into the city at no great distance from the palace.

Fliers! I think that my heart beat a little faster at the sight of them. Fliers! A means of escape from the Valley of the First Born. It might take a great deal of scheming; and would certainly entail enormous risks; but if all went well with the other part of my plan, I would find a way-and a flier.

I made my way toward the point at which I had seen the fliers disappear behind the roofs of the buildings near me, and at last my search was rewarded. I came to an enormous building some three stories high, on the roof of which I could just see a part of a flier. Practically all hangars to Barsoom are on the roofs of buildings, usually to conserve space in crowded, walled cities; so I was not surprised to find a hangar in Kamtol thus located.

I approached the entrance to the building, determined to inspect it and some of the ships if I could get in. As I stepped through the entrance, a warrior barred my way with drawn sword.

"Where do you think you're going, slave?" he demanded.

I showed him my pass.

He looked equally as surprised as the others had who had read it. "This says the freedom of the palace and the city," he said; "it doesn't say the freedom of the hangars."

"They're in the city, aren't they?" I demanded.

He shook his head. "They may be in the city, but I won't admit you. I'll call the officer."

He did so, and presently the officer appeared. "So!" he exclaimed, when he saw me; "you're the slave who could have killed Nolat, but spared his life. What do you want here?"