arranged to divert certain currents and to isolate and perhaps strand the enemy. When land-dwellers set foot in the water, they too could be tempted into the traps of nature. Still timorous, the probs developed the taste for flesh.
Then the land uplifted and the shoals passed. It was the time of desperation for the probs, and few survived, for they could not compete with the established land and sea creatures in either complete habitat. One species, the cleverest, learned to make a home where nature provided none. Unable to run fleetly or swim swiftly or take to the air, it employed its still-generalized limbs to excavate trenches at the shoreline and to bring the water in. Labyrinths were formed, confusing to predators. Those who did enter found dead ends or narrow channels that inhibited progress, while stones were dumped upon them or shafts poked through cross-trenches.
Later those stones and shafts were adapted to construction, and the age of tools and weapons had come. The trunklike appendage, no longer required fully for locomotion, became refined for manipulation; the flippers lost what swimming facility they had had and became strong excavators. The brains increased in size. Communication of high order became essential. Air, vibrated through the snout, developed into a hornlike dialogue.
The labyrinth, in the course of a hundred thousand years, developed into something like a city.
Nature heaved again and the city was destroyed — but so were the habitats of many other creatures. The probs rebuilt; the less intelligent or adaptable animals perished. The probs lost much of their timidity, and their appetite for flesh increased.
Success brought population pressure, and the attendant demand for more food and more living space. In this manner the first colony was organized, instead of the prior lemminglike exoduses to relieve the situation. Perhaps the first successful colony was merely the last of the blind departures. It was not clear how individuals were selected to go or to stay, but a complete spectrum of builders, hunters and breeders were to be found in each party. The first colony settled several hundred miles away from the home grounds, upon another shoreline. The second went farther.
At last the shores of all the continents of the planet were riddled with maze-cities.
Now there was nothing shy about the probs. Large and sleek, they encroached upon the territories of ancient enemies. Organized and clever, they conquered. They brought their habitat with them inland, developing methods of pumping and aerating and holding water above the level of the sea. Technology had come upon them.
Greater and greater ingenuity was required as the terrain became less habitable. Rain fell less frequently, and better pumps were developed; edible animal life diminished, and better breeds had to be fostered. The prob snout could now be reversed, to grip objects by its suction and move them about, but it was weak; it became easier to use this slight strength and great dexterity to build machines, and to let the machines accomplish the heavy labors.
With the conquest of the continents and the continued decimation of the vegetation, animals and minerals there, the probs next turned their technology toward really efficient food production. Sea-farms provided meat; hydroponics replaced the rest. Their science expanded to meet the new challenges, and reached into the very sky and on into space. Yet this required enormous power, and their world was already depleted by the wasteful ravagement of centuries past. They sought to colonize another world, just as they had the shores and continents of Sung, but could not afford the time and equipment for prolonged and inefficient interstellar travel.
Yet technology continued, though their world was starving. They developed the macroscope — and shied away from its revelations. Their land surface was a mass of watery warrens, their ocean a thoroughly parceled plantation. Those who could