by Gonzalo » Sun Nov 11, 2007 2:35 pm
It's the manner in which Cato uses sit (third person, singular, present of subjunctive mode of esse, to be), as far as I can understand. I have read an excerpt or selection published by Hans Orberg in a book entitled Sermones Romani (which includes I,2 from De Agri Cultura) and there's a note which states:
siet, sient=sit, sint
Regards