It is just an index; if you want the song, you may have to buy the book (if you can find a copy). There is one reference only in the Roud folk song index, to that same example. It was noted by Sabine Baring Gould from J. Peake of Liskeard in May 1891, and is in his MS collection, where Inglis Gundry found it and published it in Canow Kernow (1966 and 1972).