How long he had gone on along that almost imperceptibly curving line of border he could not have said, but after a timeless interval of gray solitude he gradually became aware that a tiny rustling and whispering among the leaves had been growing louder by degrees for some time. He looked up. In and out among the trees which bordered that solid wall of nothingness little, indistinguishable figures were flitting. The tree-men had returned. Queerly grateful for their presence, he went on a bit more cheerfully, paying no heed to their timid dartings to and fro, for Smith was wise in the ways of wild life.
Presently, when they saw how little heed he paid them, they began to grow bolder, their whispers louder. And among those rustling voices he thought he was beginning to catch threads of familiarity. Now and again a word reached his ears that he seemed to recognize, lost amidst the gibberish of their speech. He kept his head down and his hands quiet, plodding along with a cunning stillness that began to bear results.
From the corner of his eye he could see that a little dark tree-man had darted out from cover and paused midway between bush and tree to inspect the queer, tall stranger. Nothing happened to this daring venturer, and soon another risked a pause in the open to stare at the quiet walker among the trees. In a little while a small crowd of the tree-people was moving slowly parallel with his course, staring with all the avid curiosity of wild things at Smith's plodding figure. And among them the rustling whispers grew louder.
Presently the ground dipped down into a little hollow ringed with trees. It was a bit darker here than it had been on the higher level, and as he went down the slope of its side he saw that among the underbrush which filled it were cunningly hidden huts twined together out of the living bushes. Obviously the hollow was a tiny village where the tree-folk dwelt.
He was surer of this when they began to grow bolder as he went down into the dimness of the place. The whispers shrilled a little, and the boldest among his watchers ran almost at his elbow, twittering their queer, broken speech in hushed syllables whose familiarity still bothered him with its haunting echo of words he knew. When he had reached the center of the hollow he became aware that the little folk had spread out in a ring to surround him. Wherever he looked their small, anxious faces and staring eyes confronted him. He grinned to himself and came to a halt, waiting gravely.
None of them seemed quite brave enough to constitute himself spokesman, but among several a hurried whispering broke out in which he caught the words "Thag" and "danger" and "beware." He recognized the meaning of these words without placing in his mind their origins in some tongue he knew. He knit his sun-bleached brows and concentrated harder, striving to wrest from that curious, murmuring whisper some hint of its original root. He had a smattering of more tongues than he could have counted offhand, and it was hard to place these scattered words among any one speech.
But the word "Thag" had a sound like that of the very ancient dryland tongue, which upon Mars is considered at once the oldest and the most uncouth of all the planet's languages. And with that clue to guide him he presently began to catch other syllables which were remotely like syllables from the dryland speech. They were almost unrecognizable, far, far more ancient than the very oldest versions of the tongue he had ever heard repeated, almost primitive in their crudity and simplicity. And for a moment the sheerest awe came over him, as he realized the significance of what he listened to.
The dryland race today is a handful of semi-brutes, degenerate from the ages of past time when they were a mighty people at the apex of an almost forgotten glory. That day is millions of years gone now, too far in the past to have record save in the vaguest folklore. Yet here was a people who spoke the rudiments of that race's tongue as it must have been spoken in the race's dim beginnings, perhaps a million years earlier even than that immemorial time of their triumph. The reeling of millenniums set Smith's mind awhirl with the effort at compassing their span.
There was another connotation in the speaking of that tongue by these timid bush-dwellers, too. It must mean that the forgotten wizard king, Illar, had peopled his sinister, twilight land with the ancestors of today's dryland dwellers. If they shared the same tongue they must share the same lineage. And humanity's remorseless adaptability had done the rest.