serable, and howled so
much that Raoul decided to leave him behind. He was helped to reach this
decision by the fact that the ship had lost much of its air in the
accident, and he knew that the air-purifying mechanism wasn't working
too well. He figured he'd have a better chance of surviving if he stayed
in the ship alone. But it didn't do him any good. He was lost in space,
or we'd certainly have heard of him."

From outside there came the sound of a low growl. "It's Arkem!" cried
Mark. "Now you'll see. Wait till he hears me call his name."

He ran out, and Sam followed slowly. "Don't expect too much, Mark," he
said, almost with pity.

Mark didn't hear him. "Arkem!" he called. "Arkem! Arkem!"

The dog was watchful, keeping his distance and giving no sign of
recognition. Sam put his arm around his son's shoulder.

"Arkem, Arkem! Here, Arkem!"

The dog snarled.

* * * * *

There were tears in the boy's eyes. "He doesn't know his own name! He
doesn't even know his own name! Arkem!"

"It's no use, Mark, he's forgotten he ever had a name. I'm afraid you'd
better give up the idea of having him as a pet."

"But you _can't_ forget your own name!"

"You can in eight hundred years. Yes, Mark, that's when all this
happened, eight hundred years ago. That's why the language had to be
translated. Arkem is immortal. And during his long life he's forgotten
not only his name, but the master for whose sake he was marooned here.
If Julian Hagstrom were, by some miracle, to come back to life, I'm sure
the dog wouldn't remember him. All he has is a vague but strong tie to
that heap of stones. He no longer knows why he's protecting it. He's
been away from live human beings so long that his brain is little more
than a bundle of reflexes and instincts."

"I'll train him," said Mark. "Sometimes you forget a thing at first, but
it comes back to you later. He'll remember his name--here, Arkem!"

"It's no use," said Sam. "For eight hundred years he's been tied to that
heap of stones. He'll never remember anything except that fact. I'll get
you another dog for a pet."

"You mean we're going back to Mars or Earth?"

"Some place like that. Some place where there are people. Being alone in
space is no good for you."

"Oh, no, Pop, you can't get rid of me like that."

"I'm not trying to get rid of you," said Sam. "Being alone in space is
no good for me either. I'm going with you."

"Gee, are you su