The just limitation of slavery in the laws of God : compared with the unbounded claims of the African traders and British American slaveholders ; with a copious appendix, containing, an answer to the Rev. Mr. Thompson's tract in favor of the African slave trade ; letters concerning the lineal descent of the negroes from the sons of Ham ; the Spanish regulations for the gradual enfranchisement of slaves ; a proposal on the same principles for the gradual enfranchisement of slaves in America ; reports of determinations in the several courts of law against slavery, &c. /