The farther inland we went the darker it became, until we were moving at last through an endless twilight. The vegetation here was sparse and of a weird, colorless nature, though what did grow was wondrous in shape and form. Often we saw huge lidi, or beasts of burden, striding across the dim landscape, browsing upon the grotesque vegetation or drinking from the slow and sullen rivers that run down from the Lidi Plains to empty into the sea in Thuria.

What we sought was either a thag—a sort of gigantic elk—or one of the larger species of antelope, the flesh of either of which dries nicely in the sun. The bladder of the thag would make a fine water-bottle, and its skin, I figured, would be a good sail. We traveled a considerable distance inland, entirely crossing the Land of Awful Shadow and emerging at last upon that portion of the Lidi Plains which lies in the pleasant sunlight. Above us the pendent world revolved upon its axis, filling me especially—and Dian to an almost equal state—with wonder and insatiable curiosity as to what strange forms of life existed among the hills and valleys and along the seas and rivers, which we could plainly see.

Before us stretched the horizonless expanses of vast Pellucidar, the Lidi Plains rolling up about us, while hanging high in the heavens to the northwest of us I thought I discerned the many towers which marked the entrances to the distant Mahar city, whose inhabitants preyed upon the Thurians.

Juag suggested that we travel to the northeast, where, he said, upon the verge of the plain we would find a wooded country in which game should be plentiful. Acting upon his advice, we came at last to a forest-jungle, through which wound innumerable game-paths. In the depths of this forbidding wood we came upon the fresh spoor of thag.

Shortly after, by careful stalking, we came within javelin-range of a small herd. Selecting a great bull, Juag and I hurled our weapons simultaneously, Dian reserving hers for an emergency. The beast staggered to his feet, bellowing. The rest of the herd was up and away in an instant, only the wounded bull remaining, with lowered head and roving eyes searching for the foe.

Then Juag exposed himself to the view of the bull—it is a part of the tactics of the hunt—while I stepped to one side behind a bush. The moment that the savage beast saw Juag he charged him. Juag ran straight away, that the bull might be lured past my hiding-place. On he came—tons of mighty bestial strength and rage.

Dian had slipped behind me. She, too, could fight a thag should emergency require. Ah, such a girl! A rightful empress of a stone age by every standard which two worlds might bring to measure her!

Crashing down toward us came the bull thag, bellowing and snorting, with the power of a hundred outer-earthly bulls. When he was opposite me I sprang for the heavy mane that covered his huge neck. To tangle my fingers in it was the work of but an instant. Then I was running along at the beast’s shoulder.

Now, the theory upon which this hunting custom is based is one long ago discovered by experience, and that is that a thag cannot be turned from his charge once he has started toward the object of his wrath, so long as he can still see the thing he charges. He evidently believes that the man clinging to his mane is attempting to restrain him from overtaking his prey, and so he pays no attention to this enemy, who, of course, does not retard the mighty charge in the least.

Once in the gait of the plunging bull, it was but a slight matter to vault to his back, as cavalrymen mount their chargers upon the run. Juag was still running in plain sight ahead of the bull. His speed was but a trifle less than that of the monster that pursued him. These Pellucidarians are almost as fleet as deer; because I am not is one reason that I am always chosen for the close-in work of the thag-hunt. I could not keep in front of a charging thag long enough to give the killer time to do his work. I learned that the first—and last—time I tried it.