Sorry, masato, can't help on this one. I've had a whistle at the tune from the abc, and it sounds like a nursery-rhyme tune. From dim recesses of memory the words "O where o where is my little dog gone" came to me, but the only version I can find in a book has a vaguely similar sort of tune, but not that close. I'll bet it will turn up in a book of Victorian nursery rhymes eventually.