... a new source of supply. That was, in fact, the real design of the coast States. Mr. Clemens, in proof of this, referred to all the Southern Conventions of late years, and cited the admissions of Messrs. Miles , Bonham, McRae, and Crawford, in the House, to show that the object was the re-opening of the slave-trade. Suppose, said he, that they do not get, out of the Union, this equality which they now cla...