It was becoming more and more difficult to maintain our little vessel in a horizontal position. Lower and lower sagged the bow until it became necessary to stop the engine to prevent our flight terminating in a swift dive to the ground.

As the sun rose and the light of a new day swept away the darkness of night our craft gave a final spasmodic plunge, turned half upon her side, and then with deck tilting at a sickening angle swung in a slow circle, her bow dropping further below her stern each moment.

To hand-rail and stanchion we clung, and finally as we saw the end approaching, snapped the buckles of our harness to the rings at her sides. In another moment the deck reared at an angle of ninety degrees and we hung in our leather with feet dangling a thousand yards above the ground.

I was swinging quite close to the controlling devices, so I reached out to the lever that directed the rays of repulsion. The boat responded to the touch, and very gently we began to sink toward the ground.

It was fully half an hour before we touched. Directly north of us rose a rather lofty range of hills, toward which we decided to make our way, since they afforded greater opportunity for concealment from the pursuers we were confident might stumble in this direction.

An hour later found us in the time-rounded gullies of the hills, amid the beautiful flowering plants that abound in the arid waste places of Barsoom. There we found numbers of huge milk-giving shrubs-that strange plant which serves in great part as food and drink for the wild hordes of green men. It was indeed a boon to us, for we all were nearly famished.

Beneath a cluster of these which afforded perfect concealment from wandering air scouts, we lay down to sleep-for me the first time in many hours. This was the beginning of my fifth day upon Barsoom since I had found myself suddenly translated from my cottage on the Hudson to Dor, the valley beautiful, the valley hideous. In all this time I had slept but twice, though once the clock around within the storehouse of the therns.

It was mid-afternoon when I was awakened by some one seizing my hand and covering it with kisses. With a start I opened my eyes to look into the beautiful face of Thuvia.

"My Prince! My Prince!" she cried, in an ecstasy of happiness. "'Tis you whom I had mourned as dead. My ancestors have been good to me; I have not lived in vain."

The girl's voice awoke Xodar and Carthoris. The boy gazed upon the woman in surprise, but she did not seem to realize the presence of another than I. She would have thrown her arms about my neck and smothered me with caresses, had I not gently but firmly disengaged myself.

"Come, come, Thuvia," I said soothingly; "you are overwrought by the danger and hardships you have passed through. You forget yourself, as you forget that I am the husband of the Princess of Helium."

"I forget nothing, my Prince," she replied. "You have spoken no word of love to me, nor do I expect that you ever shall; but nothing can prevent me loving you. I would not take the place of Dejah Thoris. My greatest ambition is to serve you, my Prince, for ever as your slave. No greater boon could I ask, no greater honour could I crave, no greater happiness could I hope."

As I have before said, I am no ladies' man, and I must admit that I seldom have felt so uncomfortable and embarrassed as I did that moment. While I was quite familiar with the Martian custom which allows female slaves to Martian men, whose high and chivalrous honour is always ample protection for every woman in his household, yet I had never myself chosen other than men as my body servants.

"And I ever return to Helium, Thuvia," I said, "you shall go with me, but as an honoured equal, and not as a slave. There you shall find plenty of handsome young nobles who would face Issus herself to win a smile from you, and we shall have you married in short order to one of the best of them. Forget your foolish gratitude-begotten infatuation, which your innocence has mistaken for love. I like your friendship better, Thuvia."

"You are my master; it shall be as you say," she replied simply, but there was a note of sadness in her voice.

"How came you here, Thuvia?" I asked. "And where is Tars Tarkas?"

"The great Thark, I fear, is dead," she replied sadly. "He was a mighty fighter, but a multitude of green warriors of another horde than his overwhelmed him. The last that I saw of him they were bearing him, wounded and bleeding, to the deserted city from which they had sallied to attack us."

"You are not sure that he is dead, then?" I asked. "And where is this city of which you speak?"

"It is just beyond this range of hills. The vessel in which you so nobly resigned a place that we might find escape defied our small skill in navigation, with the result that we drifted aimlessly about for two days. Then we decided to abandon the craft and attempt to make our way on foot to the nearest waterway. Yesterday we crossed these hills and came upon the dead city beyond. We had passed within its streets and were walking toward the central portion, when at an intersecting avenue we saw a body of green warriors approaching.

"Tars Tarkas was in advance, and they saw him, but me they did not see. The Thark sprang back to my side and forced me into an adjacent doorway, where he told me to remain in hiding until I could escape, making my way to Helium if possible.

"'There will be no escape for me now,' he said, 'for these be the Warhoon of the South. When they have seen my metal it will be to the death.'

"Then he stepped out to meet them. Ah, my Prince, such fighting! For an hour they swarmed about him, until the Warhoon dead formed a hill where he had stood; but at last they overwhelmed him, those behind pushing the foremost upon him until there remained no space to swing his great sword. Then he stumbled and went down and they rolled over him like a huge wave. When they carried him away toward the heart of the city, he was dead, I think, for I did not see him move."

"Before we go farther we must be sure," I said. "I cannot leave Tars Tarkas alive among the Warhoons. To-night I shall enter the city and make sure."

"And I shall go with you," spoke Carthoris.

"And I," said Xodar.

"Neither one of you shall go," I replied. "It is work that requires stealth and strategy, not force. One man alone may succeed where more would invite disaster. I shall go alone. If I need your help, I will return for you."

They did not like it, but both were good soldiers, and it had been agreed that I should command. The sun already was low, so that I did not have long to wait before the sudden darkness of Barsoom engulfed us.

With a parting word of instructions to Carthoris and Xodar, in case I should not return, I bade them all farewell and set forth at a rapid dogtrot toward the city.

As I emerged from the hills the nearer moon was winging its wild flight through the heavens, its bright beams turning to burnished silver the barbaric splendour of the ancient metropolis. The city had been built upon the gently rolling foothills that in the dim and distant past had sloped down to meet the sea. It was due to this fact that I had no difficulty in entering the streets unobserved.

The green hordes that use these deserted cities seldom occupy more than a few squares about the central plaza, and as they come and go always across the dead sea bottoms that the cities face, it is usually a matter of comparative ease to enter from the hillside.

Once within the streets, I kept close in the dense shadows of the walls. At intersections I halted a moment to make sure that none was in sight before I sprang quickly to the shadows of the opposite side. Thus I made the journey to the vicinity of the plaza without detection. As I approached the purlieus of the inhabited portion of the city I was made aware of the proximity of the warriors' quarters by the squealing and grunting of the thoats and zitidars corralled within the hollow courtyards formed by the buildings surrounding each square.