For a while he could make neither head nor tail to the tangled spoor of the herd, but at last he found the point where the herders evidently had collected their charges and driven them in a more or less compact formation toward the opposite side of the forest. Nu went warily, keeping every sense alert against surprise by savage beast or man. Every living thing that he might encounter could be nothing other than an enemy. He stopped often, listening and sniffing the air. Twice he was compelled to take to the trees upon the approach of wandering beasts of prey; but when they had passed on Nu descended and resumed his trailing.
The trampled path of the herd led to the further edge of the forest, and there Nu saw unfolded below him as beautiful a scene as had ever broken upon his vision. The western sun hung low over a broad valley that stretched below him, for the wood ended upon the brow of a gentle slope that dropped downward to a blue lake sparkling in the midst of green meadows a couple of miles away.
Upon the surface of the lake, apparently floating, were a score or more strange structures. That they were man-built Nu was certain, though he never had seen nor dreamed of their like. To himself he thought of them as "caves," just as he had mentally described the shelters of the Boat Builders, for to Nu any human habitation was a "cave," and that they were the dwellings of men he had no doubt since he could see human figures passing back and forth along the narrow causeways that connected the thatched structures with the shore of the lake. Across these long bridges they were driving aurochs, too, evidently to pen them safely for the night against the night prowlers of the forest and the plain.
Until darkness settled Nu watched with unflagging interest the activities of the floating village. Then in the comparative safety of the darkness he crept down close to the water's edge. He took advantage of every tree and bush, of every rock and hollow that intervened between himself and the enemy to shelter and hide his advance. At last he lay concealed in a heavy growth of reeds upon the bank of the lake. By separating them before his eyes he could obtain an excellent view of the village without himself being discovered. The moon had risen, brilliantly flooding the unusual scene. Now Nu saw that the dwellings did not really float upon the surface. He discovered the ends of piles that disappeared beneath the surface of the water. The habitations stood upon these. He saw men and women and little children gathered upon the open platforms that encircled many of the structures, and upon the narrow bridges that spanned the water between the dwellings and the shore. Fires burned before many of the huts, blazing upon little hearths of clay that protected the planking beneath them from combustion. Nu could smell the savory aroma of cooking fish, and his mouth watered as he saw the teeth of the Lake Dwellers close upon juicy aurochs steaks, while others opened shellfish and devoured their contents raw, throwing the shells into the water below them.
But, hungry though he was for meat, the objects of his particular desire were the long spear, the heavy ax and the sharp knife of the hairy giant standing guard upon the nearest causeway. Upon him Nu's eyes rested the oftenest. He saw the villagers, the evening meal consumed and the scraps tossed into the water beneath their dwellings, engaged in noisy gossip about their fires. Children romped and tumbled perilously close to the edges of the platforms. Youths and maidens strolled to the darker corners of the village, and leaning over the low rails above the water conversed in whispers. Loud voiced warriors recounted for the thousandth time the details of past valorous deeds. The younger mothers, in little circles, gossiped with much nodding of heads, the while they suckled their babes. The old women, toothless and white-haired, but still erect and agile in token of the rigid primitive laws which governed the survival of the fit alone, busied themselves with the care of the older children and various phases of the simple household economy which devolved upon them.
The evening drew on into darkness. The children had been posted off to their skin covered, grass pallets. For another half hour the elders remained about the fires, then, by twos and threes, they also sought the interiors of the huts, and sleep. Quiet settled upon the village, and still Nu, hidden in the reeds beside the lake, watched the nearest guardsman. Now and then the fellow would leave his post to replenish a watch fire that blazed close to the shore end of his causeway. Past this no ordinary beast of prey would dare venture, nor could any do so without detection, for its light illumined brightly the end of the narrow bridge.
Nu found himself wondering how he was to reach the sentry unseen. To rush past the watch fire would have been madness, for the guard then would have ample time to raise an alarm that would call forth the entire population of the village before ever Nu could reach the fellow's side.
There was the water, of course, but even there there was an excellent chance of detection, since upon the mirrorlike surface of the moonlit lake the swimmer would be all too apparent from the village. A shadow fell directly along the side of the causeway. Could he reach that he might make his way to a point near the sentry and then clamber to close quarters before the man realized that a foe was upon him. However, the chance was slight at best, and so Nu waited hoping for some fortuitous circumstance to offer him a happier solution of his problem.
As a matter of fact he rather shrank from the unknown dangers of the strange waters in which might lurk countless creatures of destruction; but there was that brewing close at hand that was to force a decision quickly upon the troglodyte, leaving but an immediate choice between two horns of a dilemma, one carrying a known death and the other a precarious problematical fate.
It was Nu's quick ears that first detected the stealthy movement in the reeds behind him, down wind, where his scent must have been carrying tidings of his presence to whatever roamed abroad in that locality. Now the passing of a great beast of prey upon its way through the grasses or the jungle is almost noiseless, and more so are his stealthy footfalls when he stalks his quarry. You or I could not detect them with our dull ears amid the myriad sounds of a primeval night—the coughing and the moaning of the great cats punctuated by deafening roars, the lowing and bellowing and grunting of the herds—the shrill scream of pain and terror as a hunter lands upon the neck or rump of his prey—the hum of insects—the hissing of reptiles—the rustling and soughing of the night wind among the grasses and the trees. But Nu's ears were not as ours. Not only had he been aware of the passing and repassing of great beasts through the reeds behind him, but, so quick his perceptive faculties, he immediately caught the change from mere careless passage to that of stealthy stalking on the part of the creature in his rear. The beast had caught his scent and now, cautiously, he was moving straight toward the watcher upon the shore.