This song, as spelled out in the post from Malcolm Douglas on this thread,
appears in Malcolm MacFarlane's 1908 anthology, Binneas nam Bàrd.

The tune is given along with the Gaelic text.
No credit is given to Dugald MacPhail.
Mr. MacFarlane does not include his English translation --
there are no English translations in this edition.

More generally,
there are no poet/author or composer/musician credits
for the fifty-two songs printed.

More particular:
all the Gaelic Dugald-MacPhail verses in Malcolm Douglas's post are given,
with an additional verse NOT in that post.

None of the old music/melody/tune links in the earlier posts
work any longer,
so I can't confirm the melody as printed in Binneas nam Bàrd.