Who was Executed for High Treason, at Edinburgh, the 15th October, 1794 : from Personal Acquaintance and the Most Unquestionable Channels of Information : Containing, Among Other Interesting Particulars, an Account of the Remarkable Wickedness of His Youth ... Together with His Letters and Their Answers, Written After His Condemnation : to which is Prefixed, a Striking Likeness of Robert Watt, with an Exact Representation of the Pikes and Other Instruments Found in His Possession