"Have no fear!" laughed the wild pig.  "It is only called fox-fire because, in the olden days, foxes were supposed to see their way about in the forest by its light.  It comes from old, punky, rotten wood and it only glows as pale and gently as you see it now.  There is no danger.  The fox-fire comes from an old rotten stump that has been in this cave longer than I can remember.  But, even if a real fox came in this cave, out of the storm, he would do you no harm.  We are all friends here.  Now I am going to sleep again."