earth. On other planets men call them "Will-o'-the-wisps," but on this planet mankind had no name for them at all.

Then huge, pulsating glows appeared in the blackness: fireflies that Burl knew to be as long as his spear. They glided slowly through the darkness over the stream, shedding intermittent light over Burl crouched on his drifting raft. On the shore, too, tiny paired lights glowed eagerly upward as the wingless females of the species crawled to where their signals could be seen. And there were other glowing things. Fox-fire burned in the night, consuming nothing. Even the water of the river glowed with marine organisms—adapted to fresh water here—contributing their mites of brilliance.

The air was full of flying creatures. The beat of invisible wings came through the night. Above, about, on every side the swarming, feverish life of the insect world went on ceaselessly, while Burl rocked back and forth upon his unstable raft, wanting to weep because he was being carried farther away from Saya whom he could picture looking for him, now, among the hidden, furtive members of the tribe. About him sounded the discordant, machine-like mating cries of creatures trying to serve life in the midst of death and the horrible noises of those who met death and were devoured in the dark.

Burl was accustomed to such tumult. But he was not accustomed to such despair as he felt at being lost from Saya of the swift feet and white teeth and shy smile. He lay disconsolate on his bobbing craft for the greater part of the night. It was long past midnight when the raft struck gently, swung, and then remained grounded upon a shallow in the stream.

When light came back in the morning, Burl gazed about him fearfully. He was some twenty yards from the shore and thick greenish scum surrounded his disintegrating vessel. The river had widened greatly until the opposite bank was hidden in the morning mist, but the nearer shore seemed firm and no more full of dangers than the territory inhabited by Burl's tribe.

He tested the depth of the water with his spear, struck by the multiple usefulness of the weapon. The water was no more than ankle-deep.

Shivering a little, Burl stepped down into the green scum and made for the shore at top speed. He felt something soft clinging to his bare foot. With a frantic rush he ran even faster and stumbled upon the shore with horror not at his heels but on one. He stared down at his foot. A shapeless, flesh-colored pad clung to the skin. As he watched, it swelled visibly, the pink folds becoming a deeper 

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