We are aware that doubts are entertained by some of the members of the court, whether the plea in abatement is legally before the court upon this writ of error; but if that plea is regarded as waived, or out of the case upon any other ground, yet the question as to the jurisdiction of the Circuit Court is presented on the face of the bill of exception itself, taken by the plaintiff at the trial; for he admits that he and his wife were born slaves, but endeavors to make out his title to freedom and citizenship by showing that they were taken by their owner to certain places, hereinafter mentioned, where slavery could not by law exist, and that they thereby became free, and upon their return to Missouri became citizens of that State. Now, if the removal of which he speaks did not give them their freedom, then by his own admission he is still a slave; and whatever opinions may be entertained in favor of the citizenship of a free person of the African race, no one supposes that a slave is a citizen of the State or of the United States. If, therefore, the acts done by his owner did not make them free persons, he is still a slave, and certainly incapable of suing in the character of a citizen. The principle of law is too well settled to be disputed, that a court can give no judgment for either party, where it has no jurisdiction; and if, upon the showing of Scott himself, it appeared that he was still a slave, the case ought to have been dismissed, and the judgment against him and in favor of the defendant for costs, is, like that on the plea in abatement, erroneous, and the suit ought to have been dismissed by the Circuit Court for want of jurisdiction in that court. But, before we proceed to examine this part of the case, it may be proper to notice an objection taken to the judicial authority of this court to decide it; and it has been said, that as this court has decided against the jurisdiction of the Circuit Court on the plea in abatement, it has no right to examine any question presented by the exception; and that anything it may say upon that part of the case will be extra-judicial, and mere obiter dicta. This is a manifest mistake; there can be no doubt as to the jurisdiction of this court to revise the judgment of a Circuit Court, and to reverse it for any error apparent on the record, whether it be the error of giving judgment in a case over which it had no jurisdiction, or any other material error; and this, too, whether there is a plea in abatement or not.