MORE ON "RIGID DESIGNATORS"

I've been reading Frank Manuel's history of Utopian thought in the West and he claims that Turgot (1727 - 1781) introduced the notion of progress into our thinking and that he may have influenced some of our Founding Fathers, most notably Benjamin Franklin.  The notion of progress could mean that there is a great deal more flexibility in the meaning of our Constitution because the writers assumed that over time, meanings would alter and expand.