the link between Mart and Bart Stanton had not been broken. It had
become a one-way channel. Martin, in order to escape the prison of his own
body, had become a receptor for Bart's thoughts. He felt as Bart felt--the
thrill of running after a baseball, the pride of doing something clever
with his hands.

In effect, Martin ceased to think. The thoughts in his mind were Bart's.
The feeling of identity was almost complete.

To an outside observer, it appeared that Martin had become a cataleptic
schizophrenic, completely cut off from reality. The "Bart" part of him did
not want to be disturbed by the sensory impressions that "Mart's" body
provided. Like the schizophrenic, Martin was living in a little world that
was cut off from the actual physical world around his body.

The difference between Martin's condition and that of the ordinary
schizophrenic was that _his_ little world actually existed. It was an
almost exact counterpart of the world that existed in the perfectly sane,
rational mind of his brother, Bart. It grew and developed as Bart did, fed
by the telepathic flow from the stronger mind to the weaker.

There were two Barts, and no Mart at all.

And then the Neurophysical Institute had come into the picture. A new
process had been developed, by which a human being could be
reconstructed--made, literally, into a superman. The drawback was that a
normal human body resisted the process--to the death, if necessary, just
as a normal human body will resist a skin graft from an alien donor.

But the radiation-damaged body of Martin Stanton had no resistance of that
kind. With him--perhaps--the process might work.

So Bartholomew Stanton, Martin's legal guardian after the death of their
mother, had given permission for the series of operations that would
rebuild his brother.

The telepathic link, of course, had to be shut off--for a time, at least.
Part of that could be done in the treatment of Martin, but Bart, too, had
to do his part. By submitting to hypnosis, he had allowed himself to be
convinced that his name was Stanley Martin. He had taken a job on Luna,
and then had gone to the asteriods. The simple change of name and
environment had been just enough to snap the link during a time when
Martin's brain had been inactivated by therapy and anesthetics.

Only the sense of identity remained. The patient was still Bart.

Mannheim had used them both, naturally. Colonel Mannheim had the ability
to use anyone at