Thankyou for the elucidation, Ewan.  The only reference I could find to the book -outside this site, that is, where Murray of Saltspring used to refer to it regularly, though only by its title- was at the index of the Special Collections of Florida State University, where the book is credited to MacNab.  Presumably he was, as you say, the illustrator.  Murray gave the lyric in the file I linked to above.

Malcolm