Dr. Paley thinks that the emancipation of slaves should be carried on very gradually, by provision of law, under the protection of government; and that Christianity should operate as an alterative, in which way, he thinks, it has extinguished the Greek and Roman slavery, and also the feudal tyranny; and he trusts, “as Christianity advances in the world, it will banish what remains of this odious institution.” In some of his other writings, Dr. Paley suggests that Great Britain, by way of atoning for the wrongs she has done Africa, ought to transport from America free negroes, the descendants of slaves, and give them location in various parts of Africa, to serve as models for the civilization of that country. Dr. Paley’s Treatise on Moral and Political Philosophy, from which the foregoing synopsis is taken, was published to the world in 1785; but it had been delivered in lectures, almost _verbatim_, before the University of Cambridge, several years previous; and it is now a class-book in almost every high literary institution where the English language is spoken. It is, therefore, a work of high authority and great influence. But we think his definition of the term slavery is not correct. Let us repeat it: “An obligation to labour for the benefit of the master, without the contract or consent of the servant.” Many, who purchase slaves to be retained in their own families, first examine and consult with the slave, and tell him—“My business is thus; I feed and clothe thus; are you willing that I should buy you? For I will buy no slave who is not willing.” To this, it is usual for the slave to say, “Yes, master! and I hope you will buy me. I will be a good slave. You shall have no fault to find with me, or my work.” By all the claims of morality, here is a contract and consent, and the statute might make it legal. But who will say that the condition of slavery is altered thereby? But, says one, this supposition does not reach the case, because all the obligations and conditions of slavery previously existed; and, therefore, the “contract” and “consent” here only amounted to a contract and consent to change masters. Suppose then, from poverty or misfortune, or some peculiar affection of the mind, a freeman should solicit to place himself in the condition of slavery to one in whom he had sufficient confidence, (and we have known such a case,)—a freeman anxiously applying to his more fortunate friend to enter into such an engagement for life; suppose the law had sanctioned such voluntary slavery, and, when entered into, made it obligatory, binding, and final for ever. There would be nothing in such law contrary to the general powers of legislation, however impolitic it might be; and such a law did once exist among the Jews.