But it has been assumed, that this court has acted extra-judicially in giving an opinion upon the eighth section of the act of 1820, because, as it has decided that the Circuit Court had no jurisdiction of the case, this court had no jurisdiction to examine the case upon its merits. But the error of such an assertion has arisen in part from a misapprehension of what has been heretofore decided by the Supreme Court, in cases of a like kind with that before us; in part, from a misapplication to the Circuit Courts of the United States, of the rules of pleading concerning pleas to the jurisdiction which prevail in common-law courts; and from its having been forgotten that this case was not brought to this court by appeal or writ of error from a State court, but by a writ of error to the Circuit Court of the United States. The cases cited by the Chief Justice to show that this court has now only done what it has repeatedly done before in other cases, without any question of its correctness, speak for themselves. The differences between the rules concerning pleas to the jurisdiction in the courts of the United States and common-law courts have been stated and sustained by reasoning and adjudged cases; and it has been shown that writs of error to a State court and to the Circuit Courts of the United States are to be determined by different laws and principles. In the first, it is our duty ascertain if this court has jurisdiction, under the twenty-fifth section of the judiciary act, to review the case _from the State court_; and if it shall be found that it has not, the case is at end, so far as this court is concerned; for our power to review the case upon its merits has been made, by the twenty-fifth section, to depend upon its having jurisdiction; when it has not, this court cannot criticise, controvert, or give any opinion upon the merits of a case from a State court. But in a case brought to this court, by appeal or by writ of error from _a Circuit Court of the United States_, we begin a review of it, _not by inquiring if this court has jurisdiction_, but if that court has it. If the case has been decided by that court upon its merits, but the record shows it to be deficient in those averments which by the law of the United States must be made by the plaintiff in the action, to give the court jurisdiction of his case, we send it back to the court from which it was brought, with directions to be dismissed, though it has been decided there upon its merits.