The mourning poet : or The unknown comforts of imprisonment, calculated for the meridian of the three populous universities of the Queen's Bench, the Marshalsea, and Fleet; but may indifferently serve any prison in the kingdom of England, dominion of Wales, or town of Berwick upon Tweed: with a few words of Christian advice to obdurate creditors; shewing them in the present interest of the nation, to set all solvent prisoners at liberty. Written by a Poor brother in Durance.