The consideration of these circumstances occupied the attention of the commitee; and as Dr.Spaarman, who was said to have been examined by the privy council, was returning home, it was thought advisable to consider whether it would not be proper for the commitee to select certain of their own books on the subject of the Slave-trade, and send them by him, accompanied by a letter, to the King of Sweden, in which they should entreat his consideration of this powerful argument which now stood in the way of the cause of humanity, with a view that, as one of the princes of Europe, he might contribute to obviate it, by preventing his own subjects, in case of the dereliction of this commerce by ourselves, from embarking in it.

The matter having been fully considered, it was resolved that the proposed measure would be proper, and it was accordingly adopted.

By a letter received afterwards from Dr.
Spaarman, it appeared that both the letter and the books had been delivered, and received graciously; and that he was authorised to say, that, unfortunately, in consequence of those, hereditary possessions which had devolved upon his majesty, he was obliged to confess that he was the sovereign of an island, which had, been principally peopled by African slaves, but that he had been frequently mindful of their hard case.

With respect to the Slave-trade, he never heard of an instance, in which the merchants of his own native realm had embarked in it; and as they had hitherto preserved their character pure in this respect, he would do all he could, that it should not be sullied in the eyes of the generous English nation, by taking up, in the case which had been pointed out to him, such an odious concern.
By this time I had finished my Essay on the Impolicy of the Slave-trade, which I composed from materials collected chiefly during my journey to Bristol, Liverpool, and Lancaster.

These materials I had admitted with great caution and circumspection; indeed I admitted none, for which I could not bring official and other authentic documents, or living evidences if necessary, whose testimony could not reasonably be denied; and, when I gave them to the world, I did it under the impression that I ought to give them as scrupulously, as if I were to be called upon to substantiate them upon oath.