"We certainly have not," I assured him. "A few that eat insects, perhaps, like Venus's-flytrap; but no maneaters."

"You must always be on your guard when in one of our forests," he warned me. "These trees are living, carnivorous animals. They have a nervous system and a brain, and it is generally believed that they have a language and talk with one another."

Just then a hideous scream broke from above us. I looked up, expecting to see some strange, Jupiterian beast above me, but there was nothing but the writhing limbs and the staring eyes of the great blossoms of the man-trees.

Han Du laughed. "Their nervous systems are of a low order," he said, "and their reactions correspondingly slow and sluggish. It took all this time for the pain of my sword cut to reach the brain of the blossom to which that limb belongs."

"A man's life would never be safe for a moment in such a forest," I commented.

"One has to be constantly on guard," admitted Han Du. "If you ever have to sleep out in the woods, build a smudge. The blossoms don't like smoke. They close up, and then they cannot see to attack you. But be sure that you don't oversleep your smudge."

Vegetable life on Jupiter, practically devoid of sunlight, has developed along entirely different lines from that on earth. Nearly all of it has some animal attributes and nearly all of it is carnivorous, the smaller plants devouring insects, the larger, in turn, depending upon the larger animals for sustenance on up to the maneaters such as I had encountered and those which Han Du said caught and devoured even the hugest animals that exist upon this strange planet.

We posted a couple of guards, who also kept smudges burning; and the rest of us lay down to sleep. One of the men had a chronometer, and this was used to inform the men on guard when to awaken their relief's. In this way, we all took turns watching and sleeping.

When all had slept, the smudges were allowed to burn more brightly, the men cut limbs from the living trees, sliced them and roasted them. They tasted much like veal. Then we talked over our plans for the future. It was decided that we should split up into parties of two or three and scatter; so that some of us at least might have a chance to escape recapture. They said that the Morgors would hunt us down for a long time. I felt that we would be much safer remaining together as we were ten undefeatable sword-arms; but as the countries from which my companions came were widely scattered; and, as naturally, each wished if possible to return to his own home, it was necessary that we separate.

It chanced that Han Du's country lay in the general direction of Zanor, as did Pho Lar's; so we three bid good-by to the others and left them. How I was to reach faraway Zanor on a planet of twenty-three billion square miles of area, I was at some loss to conceive. So was Han Du. He told me that I would be welcome in his country, if we were fortunate enough to reach it; but I assured him that I should never cease to search for Zanor and my mate.

I shall not bore you with an account of that part of my odyssey which finally brought me to one of the cities of Han Du's country. We kept as much to cover as we could, since we knew that if Morgors were searching for us, they would be flying low in invisible ships. Forests offered us our best protection from discovery, but there were wide plains to cross, rivers to swim, mountains to climb. In this world without night, it was difficult to keep account of time; but it seemed to me that we must have traveled for months. Pho Lar remained with us for a great deal of the time, but finally he had to turn away in the direction of his own country. We were sorry to lose him, as he had developed into a splendid companion; and we should miss his sword, too.

We had met no men, but had had several encounters with wild beasts-creatures of hideous, Unearthly appearance, both powerful and voracious. I soon realized the inadequacy of our swords as a sole means of defense; so we fashioned spears of a bamboolike growth that seemed wholly vegetable. I also taught Han Du and Pho Lar how to make bows and arrows and to use them. We found them of great advantage in our hunting of smaller animals and birds for food. In the forests, we subsisted almost wholly on the meat of the man-tree.

At last Han Du and I came within sight of an ocean. "We are home," he said. "My city lies close beside the sea." I saw no city.

We had come down out of some low hills, and were walking across a narrow coastal plain. Han Du was several yards to my right, when I suddenly bumped into something solid-solid as a brick wall; but there was nothing there! The sudden collision had caused me to step back. I stretched out my hands, and felt what seemed to be a solid wall barring my way, yet only a level expanse of bare ground, but the ground was not entirely bare. It was dotted, here and there, with strange plants a simple, leafless stock a foot or two tall bearing a single fuzzy blossom at its top.

I looked around for Han Du. He had disappeared! He had just vanished like a punctured soap bubble. All up and down the shore there was no place into which he could have vanished, nothing behind which he would have hidden, no hole in the ground into which he might have darted. I was baffled. I scratched my head in perplexity, as I started on again toward the beach only to once more bump into the wall that was not there.

I put my hands against the invisible wall and followed it. It curved away from me. Foot by foot, I pursued my tantalizing investigation. After a while I was back right where I bad started from. It seemed that I had run into an invisible tower of solid air. I started off in a new direction toward the beach, avoiding the obstacle which had obstructed my way. Alter a dozen paces I ran into another; then I gave up-at least temporarily.

Presently I called Han Du's name aloud, and almost instantly he appeared a short distance from me. "What kind of a game is this?" I demanded. "I bump into a wall of solid air and when I look for you, you are not anywhere, you have disappeared."

Han Du laughed. "I keep forgetting that you are a stranger in this world," he said. "We have come to the city in which I live. I just stepped into my home to greet my family. That is why you could not see me." As he spoke, a woman appeared beside him, and a little child. They seemed to materialize out of thin air. Had I come to a land of disembodied spirits who had the power to materialize? I could scarcely believe it, as there was nothing ghostly nor ethereal about Han Du.

"This is O Ala, my mate," said Han Du. "O Ala, this is John Carter, Prince of Helium. To him we owe my escape from the Morgors."

O Ala extended her hand to me. It was a firm, warm hand of flesh and blood. "Welcome, John Carter," she said. "All that we have is yours."

It was a sweet gesture of hospitality; but as I looked around, I could not see that they had anything. "Where is the city?" I asked.

They both laughed. "Come with us," said O Ala. She led the way, apparently around an invisible corner; and there, before me, I saw an open doorway in thin air. Through the doorway, I could see the interior of a room. "Come in," invited O Ala, and I followed her into a commodious, circular apartment. Han Du followed and closed the door. The roof of the apartment was a dome perhaps twenty feet high at its center. It was divided into four rooms by sliding hangings which could be closed or drawn back against the wall.

"Why couldn't I see the house from the outside?" I asked.

"It is plastered on the outside with sands of invisibility which we find in great quantity along the beach," explained Han Du. "It is about our only protection against the Morgors. Every house in the city is thus protected, a little over five hundred of them."