It is argued, however, that the United States have no Common Law, and cannot, therefore, be governed by the rules of majority therein established. Although it may be decided that the United States have no Common Law as a source of jurisdiction, yet it cannot be questioned that they have a Common Law so far as may be necessary in determining the signification of words and the capacity of persons. Idiots and femes-coverts would not be held as _volunteers_ in the army of the United States; but their capacity is determined by the Common Law, and not by any special legislation. I conclude, therefore, that the contract of enlistment in this regiment may be avoided by a minor. It may be in the power of the Court to discharge the petitioner without passing upon all the grave questions which I have now presented. But I confidently submit, that, if these proceedings are unconstitutional and illegal, as I have urged, if the regiment is a nullity, as I believe, the truth should be declared. The regiment is soon to embark for foreign war, when its members will be beyond the kindly protection of this Court. It will be for the Court to determine whether it may not, by a just judgment, vindicate the injured laws of Massachusetts, and discharge many fellow-citizens from obligations imposed in violation of the Constitution and laws of the land. WITHDRAWAL OF AMERICAN TROOPS FROM MEXICO. SPEECH AT A PUBLIC MEETING IN FANEUIL HALL, BOSTON, FEBRUARY 4, 1847. Hon. Samuel Greele presided at this meeting. The other speakers, besides Mr. Sumner, were Rev. James Freeman Clarke, Hon. John M. Williams, Rev. Theodore Parker, Elizur Wright, and Dr. Walter Channing. There was interruption at times from lawless persons trying to drown the voice of the speaker. One of the papers remarks, that "a number of the volunteers were among the most active." MR. CHAIRMAN AND FELLOW-CITIZENS,--