FWIW, it's No. 367 in _Burns: Poems & Songs_ (James Kinsley, Ed.; Oxford U.P., 1969), which does not include songs such as those in the _Merry Muses of Caledonia_ that were merely collected by him. However, the preface gives fair warning of the vast penumbra of the Burns canon: "Where there is no present certainty, I have thought it right to be cautiously liberal...".