Interesting; all the references I've found credit it to Robert Dwyer Joyce rather than Patrick Weston Joyce, his brother.  Does anyone have the definitive word on attribution?  It looks like a poem set to music rather than a song by origin, but that's just my impression of course.  Jimmy C: if you have the technology to hand and would like to send me a .gif or .jpg of the tune in Walton's (assuming it's given), I can make a midi for the Mudcat Midi Pages.  (PM re email)

Malcolm