The letters of Algernon Sydney, in defence of civil liberty and against the encroachments of military despotism / written by an eminent citizen of Virginia, and first published in the Richmond enquirer in 1818-19 ; to which are added in an appendix, the remarks of Mr. Ritchie as referred to by the author of "Algernon Sydney" in page 30 of this pamphlet ; with an introduction by the present publisher.