The Directory of Baxter was succeeded by a publication called "Friendly Advice to the Planters: in three parts." The first of these was, "A brief Treatise of the principal Fruits and Herbs that grow in Barbadoes, Jamaica, and other Plantations in the West Indies." The second was, "The Negros Complaint, or their hard Servitude, and the Cruelties practised upon them by divers of their Masters professing Christianity." And the third was, "A Dialogue between an Ethiopian and a Christian, his Master, in America." In the last of these, Thomas Tryon, who was the author, inveighs both against the commerce and the slavery of the Africans, and in a striking manner examines each by the touchstone of reason, humanity, justice, and religion. In the year 1696, Southern brought forward his celebrated tragedy of Oronooko, by means of which many became enlightened upon the subject, and interested in it. For this tragedy was not a representation of fictitious circumstances, but of such as had occurred in the colonies, and as had been communicated in a publication by Mrs. Behn. The person, who seems to have noticed the subject next was Dr. Primatt. In his "Dissertation on the Duty of Mercy, and on the Sin of Cruelty to Brute-animals," he takes occasion to advert to the subject of the African Slave-trade. "It has pleased God," says he, "to cover some men with white skins and others with black; but as there is neither merit nor demerit in complexion, the white man, notwithstanding the barbarity of custom and prejudice, can have no right by virtue of his colour to enslave and tyrannize over the black man. For whether a man be white or black, such he is by God's appointment, and, abstractedly considered, is neither a subject for pride, nor an object of contempt." After Dr. Primatt, we come to baron Montesquieu. "Slavery," says he, "is not good in itself. It is neither useful to the master nor to the slave. Not to the slave, because he can do nothing from virtuous motives. Not to the master, because he contracts among his slaves all sorts of bad habits, and accustoms himself to the neglect of all the moral virtues. He becomes haughty, passionate, obdurate, vindictive, voluptuous, and cruel." And with respect to this particular species of slavery he proceeds to say, "it is impossible to allow the Negros are men, because, if we allow them to be men, it will begin to be believed that we ourselves are not Christians." Hutcheson, in his System of Moral Philosophy, endeavours to show that he, who detains another by force in slavery, can make no good title to him, and adds, "Strange that in any nation where a sense of liberty prevails, and where the Christian religion is professed, custom and high prospect of gain can so stupefy the consciences of men and all sense of natural justice, that they can hear such computations made about the value of their fellow-men and their liberty without abhorrence and indignation!"