The entire book The Auld Doctor and Other Poems and Songs in Scots, by David Rorie, M.D. (London: Constable & Company Ltd., 1920), can be downloaded in PDF format here:

https://www.forgottenbooks.com/en/download/TheAuldDoctor_10502298.pdf

THE LUM HAT WANTIN' THE CROON is on page 4.

I think the words are the same as those posted by Murray on Saltspring above, but the punctuation is considerably different (a lot more apostrophes and some quotation marks).