The Barry version from Maine in JAFS 24 referred to above (I think with wrong year) is a single fragmentary verse. The full entry for th e song is:

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NEW BALLAD TEXTS
BY PHILLIPS BARRY. A.M.
The following texts of six old ballads are from my collection, made during the years 1903-11.


 I.THE FALSE KNIGHT UPON THE ROAD (Child, 3)

 I. "What have you in your bottle, my dear little lad?"
 Quo the fol fol Fly on the road,
 "I have some milk for myself for to drink!"
 Said the child, who was seven years old.

In this text the words "fol fol Fly" are very likely corrupted from "foul, foul Fiend;" that is, the Devil. Fragmentary as it is, the text is interesting as attesting the survival, in America, of a ballad supposed to be long extinct, and, furthermore, as retaining a form of the theme more primitive than that of Motherwell's version.

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The journal is available at archive.org: JAFS 24 p344

Mick