The "Dreg Song" in DT I sent to DG myself, as one of a number of "bairnsangs" I had edited; tho' it's not a kid's song at all, really. As the note in DT says, it's in David Herd's great collection of folk stuff,1776, and has the line about the oyster; but that's all there is. The 4 lines quoted are (as far as I remember) just that, a fragment, and I'd be interested in knowing the others. The lines are sung by old Elspeth in Sir Walter Scott's novel "The Antiquary", chapter 41: "The herring loves the merry moonlight, The mackerel loves the wind, But the oyster loves the dredging song, For they come of a gentle kind." [My copy of the novel has "sang" and "from a gentle kind" The variants are in a copy of Scott's complete poems.] Anyhow: I've always thought that this, like much in Scott, was really made up by the author himself; and maybe some enterprising fellow has completed it. Have you got any more words, however fragmentary??