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                                 R_{X}

                           BY ALAN E. NOURSE

                _The tenth son of a tenth son was very
                sick, but it was written that he would
                never die. Of course, it was up to the
                 Earth doctor to see that he didn't!_

           [Transcriber's Note: This etext was produced from
              Worlds of If Science Fiction, October 1957.
         Extensive research did not uncover any evidence that
         the U.S. copyright on this publication was renewed.]


They didn't realize they were in trouble until it was too late to stop
it. The call from Morua II came in quite innocently, relayed to the
ship from HQ in Standard GPP Contract code for crash priority, which
meant Top Grade Planetary Emergency, and don't argue about it, fellows,
just get there, fast. Red Doctor Sam Jenkins took on