The conspirators exposed, or, An account of the apprehension, treatment in prison and repeated examinations before the Privy Council of John Smith and George Higgins on a charge of high treason [electronic resource] : with exact copies of the warrants of commitment, discharge, letters, &c., &c. : to which is added, a letter from Mr. Parkinson, containing the particulars of his examination before the Privy Council and his intercourse with ministry on the above business