From A Bibliography of Alexandre Dumas père by Frank Wild Reed: Three regular five-line stanzas, rhyming a, b, a, a, b, of which the final line of each verse is the same.
It appeared in "Le Monte-Cristo" for October 1st, 1857, in the course of one of Dumas' "Causeries." In a footnote he asks his readers' leniency, since they were dashed off on the spur of the moment.
Seemingly they have not been re-published.