They were rapidly disappearing when it occurred to me to follow them, and so, hurling caution to the winds, I sprang across the meadow in their wake with leaps and bounds even more prodigious than their own, for the muscles of an athletic Earth man produce remarkable results when pitted against the lesser gravity and air pressure of Mars.
Their way led directly towards the apparent source of the river at the base of the cliffs, and as I neared this point I found the meadow dotted with huge boulders that the ravages of time had evidently dislodged from the towering crags above.
For this reason I came quite close to the cause of the disturbance before the scene broke upon my horrified gaze.
As I topped a great boulder I saw the herd of plant men surrounding a little group of perhaps five or six green men and women of Barsoom.
That I was indeed upon Mars I now had no doubt, for here were members of the wild hordes that people the dead sea bottoms and deserted cities of that dying planet.