In quiet tones he spoke the words of the Barsoomian equivalent of our Earthly hands up! The shadow of a grim smile touched his lips, and as he saw us hesitate to obey his commands he spoke again.

"Do as I tell you and you will be well off. Keep perfect silence. A raised voice may spell your doom; a pistol shot most assuredly."

Gor Hajus raised his hands above his head and we others followed his example.

"I am Bal Zak," announced the stranger. My heart slumped.

"Then you had better commence firing," said Gor Hajus, "for you will not take us alive and we are four to one."

"Not so fast, Gor Hajus," admonished the captain of the Vosar, until you learn what is in my mind."

"That, we already know for we heard you speak of the large reward that awaited the captor of Vad Varo and Gor Hajus," snapped the assassin of Toonol.

"Had I craved that reward so much I could have turned you over to the dwar of Vobis Kan's ship when he boarded us," said Bal Zak.

"You did not know we were aboard the Vosar," I reminded him.

"Ah, but I did."

Gor Hajus snorted his disbelief.

"How then," Bal Zak reminded us, "was I able to be ready upon this very spot when you emerged from your hiding place? Yes, I knew that you were aboard."

"But how?" demanded Dar Tarus.

"It is immaterial," replied Bal Zak, "but to satisfy your natural curiosity I will tell you that I have quarters in a small room in the Tower of Thavas, my windows overlook the roof and the hangar. My long life spent aboard fliers has made me very sensitive to every sound of a ship-motors changing their speed will awaken me in the dead of night, as quickly as will their starting or their stopping. I was awakened by the starting of the motors of the Pinsar; I saw three of you upon the roof and the fourth drop from the deck of the flier as she started and my judgment told me that the ship was being sent out unmanned for some reason of which I had no knowledge. It was too late for me to prevent the act and so I waited in silence to learn what would follow. I saw you hasten into the hangar and I heard Ras Thavas' hail and your reply, and then I saw you board the Vosar. Immediately I descended to the roof and ran noiselessly to the hangar, apprehending that you intended making away with this ship; but there was no one about the controls; and from a tiny port in the control room, through which one has a view of the main cabin, I saw you enter the closet. I was at once convinced that your only purpose was to stow away for Toonol and consequently, aside from keeping an eye upon your hiding place, I went about my business as usual."

"And you did not advise Ras Thavas?" I asked.

"I advised no one," he replied. "Years ago I learned to mind my own business, to see all, to hear all and to tell nothing unless it profited me to do so."

"But you said that the reward is high for our apprehension," Gor Hajus reminded him. "Would it not be profitable to collect it?"

"There are in the breasts of honourable men," replied Bal Zak, "forces that rise superior to the lust for gold, and while Toonolians are supposedly a people free from the withering influences of sentiment yet I for one am not totally unconscious of the demand of gratitude. Six years ago, Gor Hajus, you refused to assassinate my father, holding that he was a good man, worthy to live and one that had once befriended you slightly. To-day, through his son, you reap your reward and in some measure are repaid for the punishment that was meted out to you by Vobis Kan because of your refusal to slay the sire of Bal Zak. I have sent my crew away that none aboard the Vosar but myself might have knowledge of your presence. Tell me your plans and command me in what way I may be of further service to you."

"We wish to reach the streets, unobserved," replied Gor Hajus. "Can you but help us in that we shall not put upon your shoulders further responsibility for our escape. You have our gratitude and in Toonol, I need not remind you, the gratitude of Gor Hajus is a possession that even the Jeddak has craved."

"Your problem is complicated," said Bal Zak, after a moment of thought, "by the personnel of your party. The ape would immediately attract attention and arouse suspicion. Knowing much of Ras Thavas' experiments I realized at once this morning, after watching him with you, that he had the brain of a man; but this very fact would attract to him and to you the closer attention of the masses."

"I do not need acquaint them with the fact," growled Hovan Du. "To them I need be but a captive ape. Are such unknown in Toonol?"

"Not entirely, though they are rare," replied Bal Zak. "But there is also the white skin of Vad Varo! Ras Thavas appears to have known nothing of the presence of the ape with you; but he full well knew of Vad Varo, and your description has been spread by every means at his command. You would be recognized immediately by the first Toonolian that lays eyes upon you, and then there is Gor Hajus. He has been as dead for six years, yet I venture there is scarce a Toonolian that broke the shell prior to ten years ago who does not know the face of Gor Hajus as well as he knows that of his own mother. The Jeddak himself was not better known to the people of Toonol than Gor Hajus. That leaves but one who might possibly escape suspicion and detection in the streets of Toonol."

"If we could but obtain weapons for these others," I suggested, "we might even yet reach the house of Gor Hajus' friend."

"Fight your way through the city of Toonol?" demanded Bal Zak.

"If there is no other way we should have to," I replied.

"I admire the will," commented the commander of the Vosar, "but fear that the flesh is without sufficient strength. Wait! there is a way-- perhaps. On the stage just below this there is a public depot where equilibrimotors are kept and rented. Could we find the means to obtain four of these there would be a chance, at least, for you to elude the air patrols and reach the house of Gor Hajus' friend; and I think I see a way to the accomplishment of that. The landing tower is closed for the night but there are several watchmen distributed through it at different levels. There is one at the equilibrimotor depot and, as I happen to know, he is a devotee of jetan. He would rather play jetan than attend to his duties as watchman. I often remain aboard the Vosar at night and occasionally he and I indulge in a game. I will ask him up to-night and while he is thus engaged you may go to the depot, help yourselves to equilibrimotors and pray to your ancestors that no air patrol suspects you as you cross the city towards your destination. What think you of this plan, Gor Hajus?"

"It is splendid," replied the assassin. "And you, Vad Varo?"

"If I knew what an equilibrimotor is I might be in a better position to judge the merits of the plan," I replied. "However, I am satisfied to abide by the judgment of Gor Hajus. I can assure you, Bal Zak, of our great appreciation, and as Gor Hajus has put the stamp of his approval upon your plan I can only urge you to arrange that we may put it into effect with as little delay as possible."

"Good!" exclaimed Bal Zak. "Come with me and I will conceal you until I have lured the watchman to the jetan game within my cabin. After that your fate will be in your own hands."

We followed him from the ship on to the deck of the landing stage and close under the side of the Vosar opposite that from which the watchman must approach the ship and enter it. Then, bidding us good luck, Bal Zak departed.

From the summit of the landing tower I had my first view of a Martian city.

Several hundred feet below me lay spread the broad, well-lighted avenues of Toonol, many of which were crowded with people. Here and there, in this central district, a building was raised high upon its supporting, cylindrical metal shaft; while further out, where the residences predominated, the city took on the appearance of a colossal and grotesque forest. Among the larger palaces only an occasional suite of rooms was thus raised high above the level of the others, these being the sleeping apartments of the owners, their servants or their guests; but the smaller homes were raised in their entirety, a precaution necessitated by the constant activities of the followers of Gor Hajus' ancient profession that permitted no man to be free from the constant menace of assassination. Throughout the central district the sky was pierced by the lofty towers of several other landing stages; but, as I was later to learn, these were comparatively few in number. Toonol is in no sense a flying nation, supporting no such enormous fleets of merchant ships and vessels of war as, for example, the twin cities of Helium or the great capital of Ptarth.

A peculiar feature of the street lighting of Toonol, and in fact the same condition applies to the lighting of other Barsoomian cities I have visited, I noted for the first time that night as I waited upon the landing stage for the return of Bal Zak with the watchman. The luminosity below me seemed confined directly to the area to be lighted; there was no diffusion of light upward or beyond the limits the lamps were designed to light This was effected, I was told, by lamps designed upon principles resulting from ages of investigation of the properties of light waves and the laws governing them which permit Barsoomian scientists to confine and control light as we confine and control matter. The light waves leave the lamp, pass along a prescribed circuit and return to the lamp. There is no waste nor, strange this seemed to me, are there any dense shadows when lights are properly installed and adjusted, for the waves in passing around objects to return to the lamp, illuminate all sides of them.

The effect of this lighting from the great height of the tower was rather remarkable. The night was dark, there being no moons at that hour upon this night, and the effect was that obtained when sitting in a darkened auditorium and looking upon a brilliantly lighted stage. I was still intent upon watching the life and colour beneath when we heard Bal Zak returning. That he had been successful in his mission was apparent from the fact that he was conversing with another.

Five minutes later we crept quietly from our hiding place and descended to the stage below where lay the equilibrimotor depot. As theft is practically unknown upon Barsoom, except for purposes entirely disassociated from a desire to obtain pecuniary profit through the thing stolen, no precautions are taken against theft. We therefore found the doors of the depot open and Gor Hajus and Dar Tarus quickly selected four equilibrimotors and adjusted them upon us. They consist of a broad belt, not unlike the life belt used aboard trans-oceanic liners upon Earth; these belts are filled with the eighth Barsoomian ray, or ray of propulsion, to a sufficient degree to just about equalize the pull of gravity and thus to maintain a person in equilibrium between that force and the opposite force exerted by the eighth ray. Permanently attached to the back of the belt is a small radium motor, the controls for which are upon the front of the belt.

Rigidly attached to and projecting from each side of the upper rim of the belt is a strong, light wing with small hand levers for quickly altering its position.

Gor Hajus quickly explained the method of control, but I could apprehend that there might be embarrassment and trouble awaiting me before I mastered the art of flying in an equilibrimotor. He showed me how to tilt the wings downward in walking so that I would not leave the ground at every step, and thus he led me to the edge of the landing stage.

"We will rise here," he said, "and keeping in the darkness of the upper levels seek to reach the house of my friend without being detected. If we are pursued by air patrols we must separate; and later those who escape may gather just west of the city wall where you will find a small lake with a deserted tower upon its northern rim--this tower will be our rendezvous in event of trouble. Follow me!" He started his motor and rose gracefully into the air.

Hovan Du followed him and then it was my turn. I rose beautifully for about twenty feet, floating out over the city which lay hundreds of feet below, and then, quite suddenly, I turned upside down. I had done something wrong--I was quite positive of it. It was a most startling sensation, I can assure you, floating there with my head down, quite helpless; while below me lay the streets of a great city and no softer, I was sure, than the streets of Los Angeles or Paris. My motor was still going, and as I manipulated the controls which operated the wings I commenced to describe all sorts of strange loops and spirals and spins; and then Dar Tarus came to my rescue. First he told me to lie quietly and then directed the manipulation of each wing until I had gained an upright position. After that I did fairly well and was soon rising in the wake of Gor Hajus and Hovan Du.

I need not describe in detail the hour of flying, or rather floating, that ensued. Gor Hajus led us to a considerable altitude and there, through the darkness above the city, our slow motors drove us towards a district of magnificent homes surrounded by spacious grounds; and here, as we hovered over a large palace, we were suddenly startled by a sharp challenge coming from directly above us.

"Who flies by night?" a voice demanded.

"Friends of Mu Tel, Prince of the House of Kan," replied Gor Hajus: quickly.

"Let me see your night flying permit and your flier's licence," ordered the one above us, at the same time swooping suddenly to our level and giving me my first sight of a Martian policeman. He was equipped with a much swifter and handier equilibrimotor than ours. I think that was the first fact to impress us deeply, and it demonstrated the futility of flight; for he could have given us ten minutes’ start and overhauled each of us within another ten minutes, even though we had elected to fly in different directions. The fellow was a warrior rather than a policeman, though detailed to duty such as our Earthly police officers perform; the city being patrolled both day and night by the warriors of Vobis Kan's army.

He dropped now close to the assassin of Toonol, again demanding permit and licence and at the same time flashing a light in the face of my comrade.

"By the sword of the Jeddak!" he cried. "Fortune heaps her favors upon me. Who would have thought an hour since that it would be I who would collect the reward for the capture of Gor Hajus?"

"Any other fool might have thought it," returned Gor Hajus, "but he would have been as wrong as you," and as he spoke he struck with the short-sword I had loaned him.

The blow was broken by the wing of the warrior's equilibrimotor, which it demolished, yet it inflicted a severe wound in the fellow's shoulder. He tried to back off, but the damaged wing caused him only to wheel around erratically; and then he seized upon his whistle and attempted to blow a mighty blast that was cut short by another blow from Gor Hajus' sword that split the man's head open to the bridge of his nose.

"Quick!" cried the assassin. "We must drop into the gardens of Mu Tel, for that signal will bring a swarm of air patrols about our heads."

The others I saw falling rapidly towards the ground, but again I had trouble.

Depress my wings as I would I moved only slightly downward and upon a path that, if continued, would have landed me at a considerable distance from the gardens of Mu Tel. I was approaching one of the elevated portions of the palace, what appeared to be a small suite that was raised upon its shining metal shaft far above the ground. From all directions I could hear the screaming whistles of the air patrols answering the last call of their comrade whose corpse floated just above me, a guide even in death to point the way for his fellows to search us out. They were sure to discover him and then I would be in plain view, of them and my fate sealed.

Perhaps I could find ingress to the apartment looming darkly near! There I might hide until the danger had passed, provided I could enter, undetected. I directed my course towards the structure; an open window took form through the darkness and then I collided with a fine wire netting--I had run into a protecting curtain that fends off assassins of the air from these high-flung sleeping apartments. I felt that I was lost. If I could but reach the ground I might find concealment among the trees and shrubbery that I had seen vaguely outlined beneath me in the gardens of this Barsoomian prince; but I could not drop at a sufficient angle to bring me to ground within the garden, and when I tried to spiral down I turned over and started up again. I thought of ripping open my belt and letting the eighth ray escape; but in my unfamiliarity with this strange force I feared that such an act might precipitate me to the ground with too great violence, though I was determined to have recourse to it as a last alternative if nothing less drastic presented itself.

In my last attempt to spiral downward I rose rapidly feet foremost to a sudden and surprising collision with some object above me. As I frantically righted myself, fully expecting to be immediately seized by a member of the air patrol, I found myself face to face with the corpse of the warrior Gor Hajus had slain.

The whistling of the air patrols sounded ever nearer--it could be only a question of seconds now before I was discovered--and with the stern necessity that confronted me, with death looking me in the face, there burst upon me a possible avenue of escape from my dilemma.

Seizing tightly with my left hand the harness of the dead Toonolian, I whipped out my dagger and slashed his buoyancy belt a dozen times. Instantly, as the rays escaped, his body started to drag me downward, Our descent was rapid, but not precipitate, and it was but a matter of seconds before we landed gently upon the scarlet sward of the gardens of Mu Tel, Prince of the House of Kan, close beside a clump of heavy shrubbery. Above me sounded the whistles of the circling patrols as I dragged the corpse of the warrior into the concealing depth of the foliage. Nor was I an instant too soon for safety, as almost immediately the brilliant rays of a searchlight shot downward from the deck of a small patrol ship, illuminating the open spaces of the garden all about me. A hurried glance through the branches and the leaves of my sanctuary revealed nothing of my companions and I breathed a sigh of relief in the thought that they, too, had found concealment.

The light played for a short time about the gardens and then passed on, as did the sound of the patrol's whistles, as the search proceeded elsewhere; thus giving me the assurance that no suspicion was directed upon our hiding place.

Left in darkness I appropriated such of the weapons of the dead warrior as I coveted, after having removed my equilibrimotor, which I was first minded to destroy, but which I finally decided to moor to one of the larger shrubs against the possibility that I might again have need for it; and now, secure in the conviction that the danger of discovery by the air patrol had passed, I left my concealment and started in search of my companions.

Keeping well in the shadows of the trees and shrubs I moved in the direction of the main building, which loomed darkly near at hand; for in this direction I believed Gor Hajus would lead the others as I knew that the palace of Mu Tel was to have been our destination. As I crept along, moving with utmost stealth, Thuria, the nearer moon, shot suddenly above the horizon, illuminating the night with her brilliant rays. I was close to the building's ornately carved wall at the moment; beside me was a narrow niche, its interior cast in deepest shadow by Thuria's brilliant rays; to my left was an open bit of lawn upon which, revealed in every detail of its terrifying presence, stood as fearsome a creature as my Earthly eyes ever had rested upon. It was a beast about the size of a Shetland pony, with ten short legs and a terrifying head that bore some slight resemblance to that of a frog, except that the jaws were equipped with three rows of long, sharp tusks.

The thing had its nose in the air and was sniffing about, while its great pop eyes moved swiftly here and there, assuring me, beyond the shadow of a doubt, that it was searching for someone. I am not inclined to be egotistical, yet I could not avoid the conviction that it was searching for me. It was my first experience of a Martian watch dog; and as I sought concealment within the dark shadows of the niche behind me, at the very instant that the creature's eyes alighted upon me, and heard his growl and saw him charge straight towards me, I had a premonition that it might prove my last experience with one.

I drew my long-sword as I backed into the niche, but with a sense of the utter inadequacy of the unaccustomed weapon in the face of this three or four hundred pounds of ferocity incarnate. Slowly I backed away into the shadows as the creature bore down upon me and then, as it entered the niche, my back collided with a solid obstacle that put an end to further retreat.