The text was written after their trials but before their execution. Heyland was tried on 20 June 1788 and Clarey was executed on 24 June 1788 (cf. Gentleman's magazine, 1788, v.58 p. 652).
Reproduction of original from Cambridge University Library.
Electronic reproduction. Farmington Hills, Mich. : Cengage Gale, 2009. Available via the World Wide Web. Access limited by licensing agreements.