WOLFF SAT DOWN on the grass to rest until he quit breathing so hard. He thought of how ironic it would be if the excitement were to be too much for his sixty-six-year-old heart. Dead on arrival. DOA. They—whoever "they" were—would have to bury him and put above his grave: THE UNKNOWN EARTHMAN.

He felt better then. He even chuckled while rising to his feet. With some courage and confidence, he looked around. The air was comfortable enough, about seventy degrees, he estimated. It bore strange and very pleasant, almost fruity, perfumes. Bird calls—he hoped they were only those—came from all around him. Somewhere far off, a low growl sounded, but he was not frightened. He was certain, with no rational ground for certainty, that it was the distance-muted crash of surf. The moon was full and enormous, two and a half times as large as Earth's.

The sky had lost the bright green it had had during the day and had become except for the moon's radiance, as black as the night-time sky of the world he had left. A multitude of large stars moved with a speed and in directions that made him dizzy with fright and confusion. One of the stars fell toward him, became bigger and bigger, brighter and brighter, until it swooped a few feet overhead. By the orangeyellow glow from its rear, he could see four great elliptoid wings and dangling skinny legs and, briefly, the silhouette of an antennaed head.

It was a firefly of some sort with a wingspread of at least ten feet.

Wolff watched the shifting and expanding and contracting of the living constellations until he became used to them. He wondered which direction to take, and the sound of the surf finally decided him. A shoreline would give a definite point of departure, wherever he went after that. His progress was slow and cautious, with frequent stops to listen and to examine the shadows.

Something with a deep chest grunted nearby. He flattened himself on the grass under the shadow of a thick bush and tried to breathe slowly. There was a rustling noise. A twig crackled. Wolff lifted his head high enough to look out into the moonlit clearing before him. A great bulk, erect, biped, dark, and hairy, shambled by only a few yards from him.

It stopped suddenly, and Wolff's heart skipped a beat. Its head moved back and forth, permitting Wolff to get a full view of a gorrilloid profile. However, it was not a gorilla—not a Terrestrial one, anyway. Its fur was not a solid black. Alternate stripes of broad black and narrow white zigzagged across its body and legs. Its arms were much shorter than those of its counterpart on Earth, and its legs were not only longer but straighter. Moreover, the forehead, although shelved with bone above the eyes, was high.

It muttered something, not an animal cry or moan but a sequence of clearly modulated syllables. The gorilla was not alone. The greenish moon exposed a patch of bare skin on the side away from Wolff. It belonged to a woman who walked by the beast's side and whose shoulders were hidden by his huge right arm.

Wolff could not see her face, but he caught enough of long slim legs, curving buttocks, a shapely arm, and long black hair to wonder if she were as beautiful from the front.

She spoke to the gorilla in a voice like the sound of silver bells. The gorilla answered her. Then the two walked out of the green moon and into the darkness of the jungle.

Wolff did not get up at once, for he was too shaken.

Finally, he rose to his feet and pushed on through the undergrowth, which was not as thick as that of an Earth jungle. Indeed, the bushes were widely separated. If the environment had not been so exotic, he would not have thought of the flora as a jungle. It was more like a park, including the soft grass, which was so short it could have been freshly mown.

Only a few paces further on, he was startled when an animal snorted and then ran in front of him. He got a glimpse of reddish antlers, a whitish nose, huge pale eyes, and a polka-dot body. It crashed by him and disappeared, but a few seconds later he heard steps behind him. He turned to see the same cervine several feet away. When it saw that it was detected, it stepped forward slowly and thrust a wet nose into his outstretched hand. Thereafter, it purred and tried to rub its flank against him. Since it weighed perhaps a quarter of a ton, it tended to push him away from it.

He leaned into it, rubbed it behind its large cupshaped ears, scratched its nose, and lightly slapped its ribs. The cervine licked him several times with a long wet tongue that rasped as roughly as that of a lion. His hopes that it would tire of its affections were soon realized. It left him with a bound as sudden as that which had brought it within his ken.

After it was gone, he felt less endangered. Would an animal be so friendly to a complete stranger if it had carnivores or hunters to fear?

The roar of the surf became louder. Within ten minutes he was at the edge of the beach. There he crouched beneath a broad and towering frond and examined the moon-brushed scene. The beach itself was white and, as his outstretched hand verified, made of very fine sand. It ran on both sides for as far as he could see, and the breadth of it, between forest and sea, was about two hundred yards. On both sides, at a distance, were fires around which capered the silhouettes of men and women. Their shouts and laughter, though muted by the distance, reinforced his impression that they must be human.

Then his gaze swept back to the beach near him. At an angle, about three hundred yards away and almost in the water, were two beings. The sight of them snatched his breath away.

It was not what they were doing that shocked him but the construction of their bodies. From the waist up the man and woman were as human as he, but at the point where their legs should have begun the body of each tapered into fins.

He was unable to restrain his curiosity. After caching the horn in a bed of feathery grasses, he crept along the edge of the jungle; when he was opposite the two, he stopped to watch. Since the male and female were now lying side by side and talking, their position allowed him to study them in more detail.

He became convinced they could not pursue him with any speed on land and had no weapons. He would approach them. They might even be friendly.

When he was about twenty yards from them, he stopped to examine them again. If they were mermen, they certainly were not half-piscine. The fins at the end of their long tails were on a horizontal plane, unlike those of fish, which are vertical. And the tail did not seem to have scales. Smooth brown skin covered their hybrid bodies from top to bottom.

He coughed. They looked up, and the male shouted and the female screamed. In a motion so swift he could not comprehend the particulars but saw it as a blur, they had risen on the ends of their tails and flipped themselves upward and out into the waves. The moon flashed on a dark head rising briefly from the waves and a tail darting upward.

The surf rolled and crashed upon the white sands. The moon shone hugely and greenly. A breeze from the sea patted his sweating face and passed on to cool the jungle. A few weird cries issued from the darkness behind him, and from down the beach came the sound of human revelry.

For awhile he was webbed in thought. The speech of the two merpeople had had something familiar about it, as had that of the zebrilla (his coinage for the gorilla) and the woman. He had not recognized any individual words, but the sounds and the associated pitches had stirred something in his memory. But what? They certainly spoke no language he had ever heard before. Was it similar to one of the living languages of Earth and had he heard it on a recording or perhaps in a movie?