I just want to add that perhaps it isn't uninportant that according
to the myth Isis in her search on the papyrus-boat traveled on rivers
and in swamps looking for her husbands 14 body parts. I just read
that papyrus grew in swamps: http://www.ukans.edu/history/index/europe/ancient_rome/E/Roman/Texts/s
econdary/SMIGRA*/Liber.html
Anders