A Letter to Robert Hibbert, Jun. Esq., in Reply to His Pamphlet, Entitled, "Facts Verified Upon Oath, in Contradiction of the Report of the Rev. Thomas Cooper, Concerning the General Condition of the Slaves in Jamaica," &c. &c To which are Added, a Letter from Mrs. Cooper to R. Hibbert, Jun. Esq., and an Appendix Containing an Exposure of the Falsehoods and Calumnies of that Gentleman's Affidavit-men