John Glen's 'Early Scottish Melodies', 1900, for history of the tune and quote from Ramsay's elegy. 1779 song text I found in the book cited, and I haven't found it in any earlier Scots songbook, of which I've seen most. I see in James Dick's 'The Songs of Robert Burns' that Dick cites same earliest text and tune (p. 502), and long ago conncluded the song is not that of Pattie Birnie.