Many thanks for rescuing my sanity - so I'm not the only one who learnt this song at school all those years ago and somehow got it stuck in my head.....
Especial thanks to Janet (19May09)and Christopher (29Jan10)who assembled the verses as I recall them. And to Masato (21May09) for the link to the tunes, which confirmed my memory of the Schubert version.
At long last I can sleep easy again!