The next vessel I boarded was the Fly, captain Colley:--Here I found myself for the first time on the deck of a slave-vessel.--The sight of the rooms below and of the gratings above, and of the barricade across the deck, and the explanation of the uses of all these, filled me both with melancholy and horror. I found soon afterwards a fire of indignation kindling within me. I had now scarce patience to talk with those on board. I had not the coolness this first time to go leisurely over the places that were open to me.--I got away quickly.--But that which I thought I saw horrible in this vessel had the same effect upon me as that which I thought I had seen agreeable in the other, namely, to animate and to invigorate me in my pursuit. But I will not trouble the reader with any further account of my water-expeditions, while attempting to perfect my knowledge on this subject. I was equally assiduous in obtaining intelligence wherever it could be had; and being now always on the watch, I was frequently falling in with individuals, from whom I gained something. My object was to see all who had been in Africa, but more particularly those who had never been interested, or who at any rate were not then interested, in the trade. I gained accordingly access very early to General Rooke; to Lieutenant Dalrymple, of the army; to Captain Fiddes, of the engineers; to the reverend Mr. Newton; to Mr. Nisbett, a surgeon in the Minories; to Mr. Devaynes, who was then in parliament, and to many others; and I made it a rule to put down in writing, after every conversation, what had taken place in the course of it. By these means things began to unfold themselves to me more and more, and I found my stock of knowledge almost daily on the increase.