Sir, this is the Senate of the United States, an important body, under the Constitution, with great powers. Its members are justly supposed, from age, to be above the intemperance of youth, and from character to be above the gusts of vulgarity. They are supposed to have something of wisdom, and something of that candor which is the handmaid of wisdom. Let the Senator bear these things in mind, and let him remember hereafter that the bowie-knife and bludgeon are not the proper emblems of Senatorial debate. Let him remember that the swagger of Bob Acres and the ferocity of the Malay cannot add dignity to this body. The Senator has gone on to infuse into his speech the venom which has been sweltering for months--ay, for years; and he has alleged facts that are entirely without foundation, in order to heap upon me some personal obloquy. I will not go into the details which have flowed out so naturally from his tongue. I only brand them to his face as false. I say, also, to that Senator, and I wish him to bear it in mind, that no person with the upright form of man can be allowed--(Hesitation.) MR. DOUGLAS:--Say it. MR. SUMNER:--I will say it--no person with the upright form of man can be allowed, without violation to all decency, to switch out from his tongue the perpetual stench of offensive personality. Sir, that is not a proper weapon of debate, at least, on this floor. The noisome, squat, and nameless animal, to which I now refer, is not a proper model for an American Senator. Will the Senator from Illinois take notice? MR. DOUGLAS:--I will; and therefore will not imitate you, sir. MR. SUMNER:--I did not hear the Senator. MR. DOUGLAS:--I said if that be the case I would certainly never imitate you in that capacity, recognizing the force of the illustration. MR. SUMNER:--Mr. President, again the Senator has switched his tongue, and again he fills the Senate with its offensive odor. * * * MR. DOUGLAS:--I am not going to pursue this subject further. I will only say that a man who has been branded by me in the Senate, and convicted by the Senate of falsehood, cannot use language requiring a reply, and therefore I have nothing more to say. PRESTON S. BROOKS, OF SOUTH CAROLINA. (BORN 1819, DIED 1857.) ON THE SUMNER ASSAULT; HOUSE OF REPRESENTATIVES, JULY 14, 1856. MR. SPEAKER: Some time since a Senator from Massachusetts allowed himself, in an elaborately prepared speech, to offer a gross insult to my State, and to a venerable friend, who is my State representative, and who was absent at the time.