The presbyterian covenanter displayed, in his political principles; and the impostor detected : Being an answer to an extravagant testimony, emitted by a Presbytery, usurping the title reformed, on account of their distinguishing principles, concerning civil government, in opposition to all the reformed churches. With a appendix, shewing the weakness and falshood of a flanderous missive, published by Alexander Colvill, M.D. By John Thomson, minister of the Gospel at Donughclony.