During his recent sojourn in the United States, the Author did not conceive the intention of writing a book on the subject. All he contemplated was the publication of a few letters in a London Journal on which he had been accustomed to rely for intelligence from Europe when residing in Berbice. So much he was disposed to attempt for several reasons. Having entered the States by their most Southern port--that of New Orleans, and finding himself at once in the midst of Slavery, he had opportunities of observing that system not often enjoyed by a British "Abolitionist." As the Pastor, also, of a large congregation,.