EXHAUSTED TO THE DREGS.-The controversy in Illinois between Douglas and Lincoln, on Kansas, the Kansas-Nebraska bill, Lecompton, popular sovereignty, Dred Scott, the Declaration of Independence, State rights and niggers in every style, in all its variations, has been drawn off by these two tremendous spouters to the very dregs. From Lincoln to Douglas, and from Douglas to Lincoln, their discussions have degenerated into the merest twaddle upon quibblers, "forgeries," falsehoods, and mutual recriminations of the most vulgar sort. Reduced to such extremities for their speeches, and considering that the Illinois election does not come off till November, the best thing that Douglas and Lincoln can do, is to close up their debates sine die, go home, and keep quiet till after election. Having exhausted the field of legitimate debate, and having descended into the dirty arena of personalities, they may possibly come to "the noble art of self-defence," unless their friends take them away. Let them be drawn off before they try the logic of Morrissey and the Beniela Boy, or who shall answer for the nose of "Old Abe," or the "knob" of the "Little Giant."