MR. PRESIDENT,--I hope the Senate will not take this step without considering its importance. I do not mean to oppose it, but I would ask attention to what I may call its gravity. I am not aware that a petition has ever before been withdrawn on a motion like that now made. A petition once presented comes into the possession of the Senate; it passes into its files, and into the archives of the Capitol. We are about to make a precedent for the first time. I do not say that the occasion does not justify the precedent. I incline to agree with my friend from Illinois. We owe protection, so far as we can afford it, to these petitioners; and since the Senator from Illinois regards this as the best way, I am disposed to follow him; but in doing it, I wish the Senate to take notice of the character of the step, and of the precedent they make. But this is not all, Sir. I wish the Senate to take notice that they are called to adopt this exceptional precedent by the lawless and brutal condition of the social system about these petitioners. The very fact which the Senator brings to the attention of the Senate, and on account of which he invokes an unprecedented exercise of power, is important evidence on the condition of things in one of these Rebel States. It goes to show that they are not yet in any just sense reconstructed, or prepared for reconstruction. Such an abnormal fact could not occur in any other part of our broad country. That it occurs here must be referred to remains of Rebellion not yet subdued, but which you are now called upon, in the exercise of powers under the National Constitution, to overcome and obliterate. Therefore, Sir, I regard this transaction in a double light: first, as an important precedent in the business of the Senate; secondly, as illustrating a condition of things to justify every exercise of care and diligence on our part, that it may not bring forth similar fruits hereafter. The right of petition, a great popular right, cannot be interrupted without a blow at the Constitution. OFFICIAL HISTORY OF THE REBELLION. REMARKS IN THE SENATE, ON A JOINT RESOLUTION TO PROVIDE FOR THE PUBLICATION OF THE OFFICIAL HISTORY OF THE REBELLION, MAY 24, 1866. May 24th, on motion of Mr. Wilson, of Massachusetts, the Senate considered a joint resolution to provide for the publication of an official history of the Rebellion. In the debate that ensued, Mr. Sumner said:--