A Baptist clergyman whom I met in Worcester County, Mass., a few months since, told me that his brother-in-law, a lawyer of New Orleans, who had recently paid him a visit, took up the Report of the Massachusetts Anti-Slavery Society, and read it with great interest. He then inquired, whether the principles set forth in that document were Anti-Slavery principles. Upon being informed that they were, he expressed his entire approbation of them, and full conviction that they would prevail as soon as the South understood them; for, said he, they are the principles of truth and justice, and must finally triumph. This gentleman requested to be furnished with some of our publications, and carried them to the South with him. There certainly can be no doubt to a reflecting and candid mind, as to what will and _must_ be the result of Anti-Slavery operations. Hear now the opinion of one of the leading political papers in Charleston, South Carolina, the Southern Patriot. ‘While agitation is _permitted_ in Congress, there is _no security for the South_. While discussion is _allowed_ in that body, year after year, in relation to slavery and its incidents, the rights of property at the South _must, in the lapse of a short period, be undermined_. It is the weapon of all who expect to work out _great changes in public opinion_. It was the instrument by which O’CONNELL gradually shook the fabric of popular prejudice in England on the Catholic question. His sole instrument was agitation, both in Parliament and out of it. His constant counsel to his followers was, agitate! agitate! They did agitate. They happily carried the question of Catholic rights.