suspendue à ce chêne. See " Historical Notes
5. je croi. In Old French, the ist person singular of verbs did not end in 5, thus following the Latin (amo, credo); an 5 was added later (except after e mute, J'aime) by analogy with the 2nd person ; poets use the old spelling when the word is to rhyme with one not ending in 5.
7. Qui vive? " Who goes there.3" i.e. Vive qui? For whom do you cry "Vive"? (as in "Vive le roi!"): therefore, To whose party do you belong? (Hatzfeld and Darmesteter.)