A caution and warning to Great-Britain, and her colonies [electronic resource] : in a short representation of the calamitous state of the enslaved Negroes in the British dominions. Collected from various authors, and submitted to the serious consideration of all, more especially of those in power. To which is added, an extract of a sermon, preached / by the Bishop of Gloucester, before the Society for the Propagation of the Gospel. By Anthony Benezet