Sentence:  What is more barbarous than to see a nation ... where justice is lawfully denied him, that hath not wherewithall to pay for it; and that this merchandize hath so great credit, that in a politicall government there should be set up a <WSD>fourth estate</WSD> ["tr. quatriesme estat"] of Lawyers, breathsellers and pettifoggers ... 
Meaning of the word marked with <WSD> tags:  A hypothetical fourth class of civic subjects, or fourth body (in Britain, after the Crown, and the two Houses of Parliament) which governed legislation.