You all know how it was brought about; you remember the speech of Mr. Webster on the 7th of March, 1850, a day set apart for the blessed Martyrs, Saints Perpetua and Felicitas. We all know who was the author of that law. It is Mr. Webster's Fugitive Slave Law! It was his "thunder," unquestioned and unquestionable. You know what a rapid change was wrought in the public opinion of the controlling classes, soon after its passage. First the leading whigs went over. I will not say they changed their principles, God knows, not I, what principles they have, I will only say they altered their "resolutions," and ate their own words. True, the whigs have not all gone over. There are a few who still cling to the old Whig-tree, after it has been shaken and shaken, and thrashed and thrashed, and brushed and brushed, by politicians, as apple-trees in autumn. There are still a few little apples left, small and withered no doubt, and not daring to show their dishonored heads just now, but still containing some precious seeds that may do service by and by. Whig journal after journal went over; politician after politician "caved in" and collapsed. At the sounding of the rams' horns of slavery, how quick the Whig Jericho went down! Its fortresses of paper resolutions rolled up and blew away. Of course, men changed only after "logical conviction." Of course, nobody expected a "reward" for the change, at least only in the world to come. Were they not all Christians? True, on the 17th of June last, seventy-five years after the battle of Bunker Hill, Mr. Webster said in the Senate, that if the North should vote for the Fugitive Slave Bill, a Tariff was expected. But that was of no moment, no more than worldly riches to "the elect." Of course, a man has a right to change his opinions every ten minutes, if he has a good and sufficient reason. Of course, these men expected no offices under this or any future President! But presently the Fugitive Slave Law became a Whig doctrine, a test of party fidelity and fitness for office! You all remember the "Union" meeting in Boston. On that occasion, democrats "of the worst kind" suddenly became "respectable." The very democratic prince of devils was thought to be as good a "gentleman" as any in the city. It was curious to see the effect of the Fugitive Slave Law on the democratic party. Democrat after democrat "caved in;" journal after journal went over; horse, foot, and dragoons, they went over. The Democratic party North, and American Slavery South, have long been accustomed to accommodate themselves with the same nag after the old fashion of "ride and tye." In the cities, democrats went over in tribes; entire Democratic Zabulons and Nephthalims, whole Galilees of Democratic Gentiles, all at once saw great Whig light; and to them that sat in the shadow of Freedom, Slavery sprung up.