A dissuasion to Great-Britain and the colonies, from the slave trade to Africa : Shewing, the contradiction this trade bears, both to laws divine and provincial; the disadvantages arising from it, and advantages from abolishing it, both to Europe and Africa, particularly to Britain and the plantations. Also shewing, how to put this trade to Africa on a just and lawful footing. By James Swan, a native of Great-Britain, and friend to the welfare of this continent.