Voice of Warning.

VOICE OF WARNING.--Mr. Bingham, a democratic representative of Michigan, in the House of Representatives, made a speech in Congress on the 4th ult., in which, alluding to the defeat of the Democratic party in 1848, he said:

"Mr. Chairman, others may speculate as to the causes of that defeat. I have no hesitation in ascribing it to that fatal Nicholson letter, the doctrines of which were received by the people with such perfect loathing, the loss of the north, while the slaveholders of the south preferred to vote for the owner of a sugar plantation, with three hundred negroes. This was a mortifying defeat, but it may well be borne, if it inculcates this useful lesson that in this noon of the nineteenth century, when the down-trodden nations of Europe are bursting the fetters of tyranny which bound them to the earth for ages - when every breeze which crosses the Atlantic, wafts with it the cry of Liberty and the inalienable rights of man, from the uprising masses - the Northern statesman, to be successful, must prove true to the interests of free labor, which he represents, instead of being an accessary, to the cupidity of the southern slaveholder, who would doom his fellow man to perpetual bondage." - Aman. & Repub.