Minutes of the evidence taken at the Bar of the House of Lords [electronic resource] : Upon the order make for taking into consideration the present state of the trade of Aftica, and particularly the trade in slaves; and also for taking into consideration the nature, extent, and importance of the sugar, coffee, and cotton trade; and the general state and condition of the West India islands, and the means of improving the same; and for the Lords to be summoned; and for the agents of the West India colonies to be heard by their counsel at the bar of the house, in support of their petition against the abolition of the slave trade