whole record is before this Court for examination and decision; and, if the sum in controversy is large enough to give jurisdiction, it is not only the right, but it is the judicial duty, of the Court to examine the whole case as presented by the record; and if it appears upon its face that any material error or errors have been committed by the court below, it is the duty of this Court to reverse the judgment, and remand the case. And certainly an error in passing a judgment upon the merits in favor of either party, in a case which it was not authorized to try, and over which it had no jurisdiction, is as grave an error as a court can commit.

The plea in abatement is not a plea to the jurisdiction of this Court, but to the jurisdiction of the Circuit Court. And it appears by the record before us that the Circuit Court committed an error in deciding that it had jurisdiction upon the facts in the case, admitted by the pleadings. It is the duty of the appellate tribunal to correct this error; but that could not be done by dismissing the case for want of jurisdiction here, for that would leave the erroneous judgment in full force, and the injured party without remedy. And the appellate court, therefore, exercises the power for which alone appellate courts are constituted, by reversing the judgment of the court below for this error. It exercises its proper and appropriate jurisdiction over the judgment and proceedings of the Circuit Court, as they appear upon the record brought up by the writ of error.

The correction of one error in the court below does not deprive the appellate court of the power of examining further into the record, and correcting any other material errors which may have been committed by the inferior court. There is certainly no rule of law, nor any practice, nor any decision of a court, which even questions this power in the appellate tribunal. On the contrary, it is the daily practice of this Court, and of all appellate courts where they reverse the judgment of an inferior court for error, to correct by its opinions whatever errors may appear on the record material to the case; and they have always held it to be their duty to do so where the silence of the court might lead to misconstruction or future controversy, and the point has been relied on by either side, and argued before the court.

In the case before us, we have already decided that the Circuit

Court erred in deciding that it had jurisdiction upon the facts admitted by the pleadings. And it appears that, in the further progress of the case, it acted upon the erroneous principle it had decided on the pleadings, and gave judgment for the defendant, where, upon the facts admitted in the exception, it had no jurisdiction.

We are at a loss to understand upon what principle of law, applicable to appellate jurisdiction, it can be supposed that this Court has not judicial authority to correct the last-mentioned error, because they had before corrected the former; or by what process of reasoning it can be made out, that the error of an inferior court in actually pronouncing judgment for one of the parties, in a case in which it had no jurisdiction, cannot be looked into or corrected by this Court, because we have decided a similar question presented in the pleadings. The last point is distinctly presented by the facts contained in the plaintiff's own bill of exceptions, which he himself brings here by this writ of error. It was the point which chiefly occupied the attention of the counsel on both sides in the argument, and the judgment which this Court must render upon both errors is precisely the same. It must, in each of them, exercise jurisdiction over the judgment, and reverse it for the errors committed by the court below; and issue a mandate to the Circuit Court to conform its judgment to the opinion pronounced by this Court, by dismissing the case for want of jurisdiction in the Circuit Court. This is the constant and invariable practice of this Court, where it reverses a judgment for want of jurisdiction in the Circuit Court.

It can scarcely be necessary to pursue such a question further. The want of jurisdiction in the court below may appear on the record without any plea in abatement. This is familiarly the case where a court of chancery has exercised jurisdiction in a case where the plaintiff had a plain and adequate remedy at law, and it so appears by the transcript when brought here by appeal. So, also, where it appears that a court of admiralty has exercised jurisdiction in a case belonging exclusively to a court of common law. In these cases there is no plea in abatement. And for the same reason, and upon the same principles, where the defect of jurisdiction is patent upon the record, this Court is bound to reverse the judgment, although the defendant has not pleaded in abatement to the jurisdiction of the inferior court.

The cases of Jackson vs. Ashton, and of Capron vs. Van Noorden, to which we have referred in a previous part of this opinion, are directly in point. In the last-mentioned case, Capron brought an action against Van Noorden in a Circuit Court of the United States, without showing, by the usual averments of citizenship, that the court had jurisdiction. There was no plea in abatement put in, and the parties went to trial upon the merits. The court gave judgment in favor of the defendant, with costs. The plaintiff thereupon brought his writ of error, and this Court reversed the judgment given in favor of the defendant, and remanded the case with directions to dismiss it, because it did not appear by the transcript that the Circuit Court had jurisdiction.

The case before us still more strongly imposes upon this Court the duty of examining whether the court below has not committed an error in taking jurisdiction and giving a judgment for costs in favor of the defendant; for in Capron vs. Van Noorden the judg ment was reversed, because it did not appear that the parties were citizens of different States. They might or might not be. But in this case it does appear that the plaintiff was born a slave; and if the facts upon which he relies have not made him free, then it appears affirmatively on the record that he is not a citizen, and consequently his suit against Sandford was not a suit between citizens of different States, and the court had no authority to pass any judgment between the parties. The suit ought, in this view of it, to have been dismissed by the Circuit Court; and its judgment in favor of Sandford is erroneous, and must be reversed.

It is true that the result either way, by dismissal or by a judgment for the defendant, makes very little, if any, difference in a pecuniary or personal point of view to either party. But the fact that the result would be very nearly the same to the parties in either form of judgment, would not justify this court in sanctioning an error in the judgment which is patent on the record, and which, if sanctioned, might be drawn into precedent, and lead to serious mischief and injustice in some future suit.

We proceed, therefore, to inquire whether the facts relied on by the plaintiff entitle him to his freedom.

The case, as he himself states it on the record brought here by his writ of error, is this:

The plaintiff was a negro slave belonging to Dr. Emerson, who

was a surgeon in the army of the United States. In the year 1834, he took the plaintiff from the State of Missouri to the military post at Rock Island, in the State of Illinois, and held him there as a slave until the month of April or May, 1836. At the time last mentioned, said Dr. Emerson removed the plaintiff from said military post at Rock Island to the military post at Fort Snelling, situate on the west bank of the Mississippi River, in the territory known as Upper Louisiana, acquired by the United States of France, and situate north of the latitude of thirty-six degrees thirty minutes north, and north of the State of Missouri. Said Dr. Emerson held the plaintiff in slavery, at said Fort Snelling, from said last-mentioned date until the year 1838.

In the year 1835, Harriet, who is named in the second count of the plaintiff's declaration, was the negro slave of Major Taliaferro, who belonged to the army of the United States. In that year, 1835, said Major Taliaferro took said Harriet to said Fort Snelling, a military post, situated as hereinbefore stated, and kept her there as a slave until the year 1836, and then sold and delivered her as a slave, at said Fort Snelling, unto the said Dr. Emerson hereinbefore named. Said Dr. Emerson held said Harriet in slavery at said Fort Snelling until the year 1838.

In the year 1836, the plaintiff and Harriet intermarried, at Fort Snelling, with the consent of Dr. Emerson, who then claimed to be their master and owner. Eliza and Lizzie, named in the third count of the plaintiff's declaration, are the fruit of that marriage. Eliza is about fourteen years old, and was born on board the steamboat Gipsey, north of the north line of the State of Missouri, and upon the river Mississippi. Lizzie is about seven years old, and was born in the State of Missouri, at the military post called Jefferson Barracks.

In the year 1838, said Dr. Emerson removed the plaintiff and said Harriet, and their said daughter Eliza, from said Fort Snelling to the State of Missouri, where they have ever since resided.

Before the commencement of this suit, said Dr. Emerson sold and conveyed the plaintiff, and Harriet, Eliza, and Lizzie, to the defendant, as slaves, and the defendant has ever since claimed to hold them, and each of them, as slaves.

In considering this part of the controversy, two questions arise: 1. Was he, together with his family, free in Missouri by reason

of the stay in the territory of the United States hereinbefore mentioned? And, 2. If they were not, is Scott himself free by reason of his removal to Rock Island, in the State of Illinois, as stated in the above admissions?

We proceed to examine the first question.

The Act of Congress, upon which the plaintiff relies, declares that slavery and involuntary servitude, except as a punishment for crime, shall be forever prohibited in all that part of the territory ceded by France, under the name of Louisiana, which lies north of thirty-six degrees thirty minutes north latitude, and not included within the limits of Missouri. And the difficulty which meets us at the threshold of this part of the inquiry is, whether Congress was authorized to pass this law under any of the powers granted to it by the Constitution; for if the authority is not given by that instrument, it is the duty of this Court to declare it void and inoperative, and incapable of conferring freedom upon any one who is held as a slave under the laws of any one of the States.

The counsel for the plaintiff has laid much stress upon that article in the Constitution which confers on Congress the power "to dispose of and make all needful rules and regulations respecting the territory or other property belonging to the United States;" but, in the judgment of the Court, that provision has no bearing on the present controversy, and the power there given, whatever it may be, is confined, and was intended to be confined, to the territory which at that time belonged to or was claimed by the United States, and was within their boundaries as settled by the treaty with Great Britain, and can have no influence upon a territory afterwards acquired from a foreign Government. It was a special provision for a known and particular territory, and to meet a present emergency, and nothing more.

A brief summary of the history of the times, as well as the careful and measured terms in which the article is framed, will show the correctness of this proposition.

It will be remembered that, from the commencement of the Revolutionary war, serious difficulties existed between the States, in relation to the disposition of large and unsettled territories which were included in the chartered limits of some of the States. And some of the other States, and more especially Maryland, which had no unsettled lands, insisted that as the unoccupied