Finally, Vico proposes a curriculum that concludes with the study of eloquence, a study which he secs as interdisciplinary and (in modern terms) meta-theoretical, a way to link the other disciplines and bring them to bear on important public issues.
This calls to mind Muckelbauer's discussion of rhetoric's "promiscuity." However Muckelbauer would probably not like the idea of calling rhetoric "interdisciplinary," because that would promote the idea that there are specific, stable "fields" that we may choose to combine with the "field" of rhetoric.