We were all pretty well rested up by this time, and I undertook to do a little exploring in the vicinity of the ship, going out for a few hours each day with a single companion, leaving the other three upon the ship. I never went far afield at first, confining myself to an area some five miles in diameter between the crater and the river. Upon both sides of the latter, below where the ship had landed, was a considerable extent of forest. I ventured into this upon several occasions and once, just about time for us to return to the ship, I came upon a well marked trail in the dust of which were the imprints of three-toed feet. Each day I set the extreme limit of time that I would absent myself from the ship with instructions that two of those remaining aboard should set out in search of me and my companion, should we be absent over the specified number of hours. Therefore, I was unable to follow the trail the day upon which I discovered it, since we had scarcely more than enough time to make a brief examination of the tracks if we were to reach the ship within the limit I had allowed.

It chanced that Norton was with me that day and in his quiet way was much excited by our discovery. We were both positive that the tracks had been made by a four-footed animal, something that weighed between two hundred and fifty and three hundred pounds. How recently it had been used we could scarcely estimate, but the trail itself gave every indication of being a very old one. I was sorry that we had no time to pursue the animal which had made the tracks but determined that upon the following day I should do so. We reached the ship and told the others what we had discovered. They were much interested and many and varied were the conjectures as to the nature of the animals whose tracks we had seen.

After Orthis had been released from arrest Norton had asked permission to return to the former’s stateroom. I had granted his request and the two had been very much together ever since. I could not understand Norton’s apparent friendship for this man, and it almost made me doubt the young ensign. One day I was to learn the secret of this intimacy, but at the time I must confess that it puzzled me considerably and bothered me not a little, for I had taken a great liking to Norton and disliked to see him so much in the company of a man of Orthis’ character.

Each of the men had now accompanied me on my short excursions of exploration with the exception of Orthis. Inasmuch as his parole had fully reinstated him among us in theory at least, I could not very well discriminate against him and leave him alone of all the others aboard ship as I pursued my investigations of the surrounding country.

The day following our discovery of the trail, I accordingly invited him to accompany me, and we set out early, each armed with a revolver and a rifle. I advised West, who automatically took command of the ship during my absence, that we might be gone considerably longer than usual and that he was to feel no apprehension and send out no relief party unless we should be gone a full twenty-four hours, as I wished to follow up the spoor we had discovered, learn where the trail led and have a look at the animal that had made it.

I led the way directly to the spot at which we had found the trail, about four miles down river from the ship and apparently in the heart of dense forest.

The flying-toads darted from tree to tree about us, uttering their weird and plaintive cries, while upon several occasions, as in the past, we saw four-legged snakes’ such as we had seen upon the day of our landing. Neither the toads nor the snakes bothered us, seeming only to wish to avoid us.

Just before we came upon the trail, both Orthis and I thought we heard the sound of footsteps ahead of us—something similar to that made by a galloping animal—and when we came upon the trail a moment later it was apparent to both of us that dust was hanging in the air and slowly settling on the vegetation nearby. Something, therefore, had passed over the trail but a minute or two before we arrived. A brief examination of the spoor revealed the fact that it had been made by a three-toed animal whose direction of travel was to our right and toward the river, at this point some half mile from us.

I could not help but feel considerable inward excitement, and I was sorry that one of the others had not been with me, for I never felt perfectly at ease with Orthis. I had done considerable hunting in various parts of the world where wild game still exists but I had never experienced such a thrill as I did at the moment that I undertook to stalk this unknown beast upon an unknown trail in an unknown world. Where the trail would lead me, what I should find upon it, I never knew from one step to another, and the lure of it because of that was tremendous. The fact that there were almost nine million square miles of this world for me to explore, and that no Earth Man had ever before set foot upon an inch of it, helped a great deal to compensate for the fact that I knew I could never return to my own Earth again.

The trail led to the edge of the river which at this point was very wide and shallow. Upon the opposite shore, I could see the trail again directly opposite and I knew therefore that this was a ford. Without hesitating, I stepped into the river, and as I did so I glanced to my left to see stretching before me as far as my eye could reach a vast expanse of water. Here then I had stumbled upon the mouth of the river and, beyond, a lunar sea.