If, however, the fact of citizenship is averred in the declaration, and the defendant does not deny it, and put it in issue by plea in abatement, he cannot offer evidence at the trial to disprove it, and consequently cannot avail himself of the objection in the appellate court, unless the defect should be apparent in some other part of the record.

It is needless to accumulate cases on this subject. Those already referred to, and the cases of Capron v. Van Noorden, (in 2 Cr., 126,) and Montalet v. Murray, (4 Cr., 46,) are sufficient to show the rule of which we have spoken. The case of Capron v. Van Noorden strikingly illustrates the difference between a common-law court and a court of the United States.

It is suggested, however, that this plea is not before us; and that as the judgment in the court below on this plea was in favor of the plaintiff, he does not seek to reverse it, or bring it before the court for revision by his writ of error; and also that the defendant waived this defence by pleading over, and thereby admitted the jurisdiction of the court.

To this plea the plaintiff demurred, and the defendant joined in demurrer. The court overruled the plea, and gave judgment that the defendant should answer over. And he thereupon put in sundry pleas in bar, upon which issues were joined; and at the trial the verdict and judgment were in his favor. Whereupon the plaintiff brought this writ of error.

his case has been twice argued. After the argument at the last term, differences of opinion were found to exist among the members of the court; and as the questions in controversy are of the highest importance, and the court was at that time much pressed by the ordinary business of the term, it was deemed advisable to continue the case, and direct a re-argument on some of the points, in order that we might have an opportunity of giving to the whole subject a more deliberate consideration. It has accordingly been again argued by counsel, and considered by the court; and I now proceed to deliver its opinion.

On the trial of this cause by the jury, the plaintiff, to maintain the issues on his part, read to the jury the following agreed statement of facts, (see agreement above.) No further testimony was given to the jury by either party. Thereupon the plaintiff moved the court to give to the jury the following instruction, viz:

And the said John F. A. Sandford, in his own proper person, comes and says that this court ought not to have or take further cognizance of the action aforesaid, because he says that said cause of action, and each and every of them, (if any such have accrued to the said Dred Scott,) accrued to the said Dred Scott out of the jurisdiction of this court, and exclusively within the jurisdiction of the courts of the State of Missouri, for that, to wit: the said plaintiff, Dred Scott, is not a citizen of the State of Missouri, as alleged in his declaration, because he is a negro of African descent; his ancestors were of pure African blood, and were brought into this country and sold as negro slaves, and this the said Sandford is ready to verify. Wherefore, he prays judgment whether this court can or will take further cognizance of the action aforesaid.