I don't think much of the Queen of Hearts line, as I have said, but one thing that could be said about the "tarts" line is that it links to the felt undercurrent of prostitution and desire throughout the song. "of a deep ravine, where can be seen, the worth of passion's pledge" is, to my mind, a reference to eyeing where students went with prostitutes for a few minutes near the university. First time I heard the song, I assumed it was about the poet and a prostitute he demeaned himself with -- all that streetwalking in the song -- (didn't know about the history) -- but the song has that feel about it. Or I have completely projected it into it, of course.

yours, Peter T.