frowned on in polite society.

However, Junior's appearance and rate of locomotion made it clear he would soon be done with juvenile follies. As Pater repeated with satisfaction—you can't beat Biology; as one becomes more and more bottle-shaped, the romantic illusions of youth must inevitably perish.

"I always knew there was sound stuff in the youngster," declared Pater expansively.

"At least he won't be able to go around with those ragamuffins much longer," breathed Mater thankfully.

"What does the young fool think he's doing, fiddling round with soapstone?" grumbled Pater, peering critically through the green to try to make out the details of Junior's building. "Doesn't he know it's apt to slip its place in a year or two?"

"Look, dear," hissed Mater acidly, "isn't that the little polyp who was so rude once?... I wish she wouldn't keep watching Junior like that. Our northwest neighbor heard positively that she's the child of an only parent!"

"Never mind." Pater turned to reassure her. "Once Junior is properly rooted, his self-respect will cause him to keep riffraff at a distance. It's a matter of Psychology, my dear; the vertical position makes all the difference in one's thinking."

The great day arrived. Laboriously Junior put a few finishing touches to his construction—which, so far as could be seen from a distance, had turned out decent-looking enough, though it was rather questionably original in design: lower and flatter than was customary.

With one more look at his handiwork, Junior turned bottom-end-down and sank wearily onto the finished site. After a minute, he paddled experimentally, but flailing tentacles failed to lift him. He was already rooted, and growing more solidly so by the moment.

"Congratulations!" cried the neighbors. Pater and Mater bowed this way and that in acknowledgment. Mater waved a condescending tentacle to the three maiden aunts.

"I told you so!" said Pater triumphantly.

"Yes, dear...." said Mater meekly.

Suddenly there were outcries of alarm from the dwellers down-reef. A wave of dismay swept audibly through all the nearer part of the colony. Pater and Mater looked around, and froze.

Junior had begun paddling again, but this time in a most peculiar manner—with a rotary twist and sidewise scoop which looked awkward, but which he performed so deftly that he must have practiced it. Fixed upright as he was now on the platform he had built, he looked for all the world as if he were trying to swim sidewise.

"He's gone mad!" squeaked Mater.

"I ..." gulped Pater, "I'm afraid not."

At least, they saw, there was method in Junior's actions. He went on paddling in the same fashion and now he, and his platform with him, were farther away than they had been, and growing more remote as they stared.

Parts of the homesite that was not a homesite revolved in some way incomprehensible to eyes that had never seen the like. And the whole affair trundled along, rocking at bumps in the sandy bottom, and squeaking painfully; nevertheless, it moved.

The polyps watching from the reef swam out and frolicked after Junior, watching his contrivance go and chattering eager questions, while their parents bawled at them to keep away from that.

The three maiden aunts shrieked faintly and swooned in one another's tentacles. The colony was shaken as it had not been since the tidal wave.

"COME BACK!" thundered Pater. "You CAN'T do that!"

"Come back!" shrilled Mater. "You can't do that!"

"Come back!" gabbled the neighbors. "You can't do that!"

But Junior was past listening to reason. Junior was on wheels.