OCTOBER TERM, 1961. Opinion of the Court. 369 U. S. fication of the issues presently confronting us demands clear exposition of the grounds upon which the District Court rested in dismissing the case. The dismissal order recited that the court sustained the appellees' grounds "(1) that the Court lacks jurisdiction of the subject matter, and (2) that the complaint fails to state a claim upon which relief can be granted .... In the setting of a case such as this, the recited grounds embrace two possible reasons for dismissal: First: That the facts and injury alleged, the legal bases invoked as creating the rights and duties relied upon, and the relief sought, fail to come within that language of Article III of the Constitution and of the jurisdictional statutes which define those matters concerning which United States District Courts are empowered to act; Second: That, although the matter is cognizable and facts are alleged which establish infringement of appellants' rights as aresult of state legislative action departing from a federal constitutional standard, the court will not proceed because the matter is considered unsuited to judicial inquiry or adjustment. We treat the first ground of dismissal as "lack of jurisdiction of the subject matter." The second we consider to result in a failure to state a justiciable cause of action. The District Court's dismissal order recited that it was issued in conformity with the court's per curiam opinion. The opinion reveals that the court rested its dismissal upon lack of subject-matter jurisdiction and lack of a justiciable cause of action without attempting to distinguish between these grounds. After noting that the plaintiffs challenged the existing legislative apportionment in Tennessee under the Due Process and Equal Protection Clauses, and summarizing the supporting allegations and the relief requested, the court stated that "The action is presently before the Court upon the defendants' motion to dismiss predicated upon three

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