upon which evidence had been given, that, exclusively of such as perished before they sailed from Africa, not less than twelve and a half per cent died on their passage:  besides these, the Jamaica report stated that four and a half per cent died while in the harbours, or on shore before the day of sale, which was only about the space of twelve or fourteen days after their arrival there; and one third more died in the seasoning:  and this in a climate exactly similar to their own, and where, as some of the witnesses pretended, they were healthy and happy.  Thus, out of every lot of one hundred, shipped from Africa, seventeen died in about nine weeks, and not more than fifty lived to become effective labourers in our islands.

Having advanced thus far in his investigation, he felt, he said, the wickedness of the Slave-trade to be so enormous, so dreadful, and irremediable, that he could stop at no alternative short of its abolition.  A trade founded on iniquity, and carried on with such circumstances of horror, must be abolished, let the policy of it be what it might; and he had from this time determined, whatever were the consequences, that he would never rest till he had effected that abolition.  His mind had indeed been harassed by the objections of the West India planters, who had asserted, that the ruin of their property must be the consequence of such a measure.  He could not help, however, distrusting their arguments.  He could not believe that the Almighty Being, who had forbidden the practice of rapine and bloodshed, had made rapine and bloodshed necessary to any part of his universe.  He felt a confidence in this persuasion, and took the resolution to act upon it.  Light indeed soon broke in upon him.  The suspicion of his mind was every day confirmed by increasing information, and the evidence he had now to offer upon this point was decisive and complete.  The principle upon which he founded the necessity of the abolition was not policy, but justice:  but, though justice were the principle of the measure, yet he trusted he should distinctly prove it to be reconcileable with our truest political interest.

In the first place, he asserted that the number of the slaves in our West India islands might be kept up without the introduction of recruits from Africa; and to prove this, he would enumerate the different sources of their mortality.  The first was the disproportion of the sexes, there being, upon an average, about five males imported to three females:  but this evil, when the Slave-trade was abolished, would cure itself.  The second consisted in the bad condition in which they were brought to the islands, and the methods of preparing them for sale.  They arrived frequently in a sickly and disordered state, and then they were made up for the market by the application of astringents, washes, mercurial ointments, and repelling drugs, so that their wounds and diseases might be hid.  These artifices were not only fraudulent but fatal: