[net.sf-lovers] can you identify this story?

kramer (07/27/82)

This is an outline of a story that I read many
years ago.  Can anyone tell me what, where, and
who by it is?

- being (man like) wakes up in cave
- enters earth community which has stagnated
- does some fiddling to cause man to evolve
  properly again
- goes back to sleep in cave ... turns out
  that he woke up once in the times of
  King Arthur, being Merlin.  He is supposed
  to wake up every thousand years or so to
  make sure humans are going the way they
  should.

Thanks in advance.